diff --git a/FT_functions/functions/src/index.ts b/FT_functions/functions/src/index.ts
index 22ef8916..34496c1a 100644
--- a/FT_functions/functions/src/index.ts
+++ b/FT_functions/functions/src/index.ts
@@ -9,6 +9,7 @@ import {
 } from "./functionConfig";
 
 import { getTriggerType } from "./utils";
+//import {propagateChangesOnTrigger} from './propagates'
 
 export const FT = {
   [functionName]: functions.firestore
@@ -16,24 +17,28 @@ export const FT = {
     .onWrite(async (change, context) => {
       const triggerType = getTriggerType(change);
       let promises: Promise<any>[] = [];
-      try {
-        const sparkPromises = sparksConfig
-          .filter((sparkConfig) => sparkConfig.triggers.includes(triggerType))
-          .map((sparkConfig) => spark(sparkConfig)(change, context));
-        console.log(
-          `#${sparkPromises.length} sparks will be evaluted on ${triggerType}`
+      const sparkPromises = sparksConfig
+        .filter((sparkConfig) => sparkConfig.triggers.includes(triggerType))
+        .map((sparkConfig) => spark(sparkConfig)(change, context));
+      console.log(
+        `#${sparkPromises.length} sparks will be evaluted on ${triggerType}`
+      );
+      promises = sparkPromises;
+      if (triggerType !== "delete") {
+        const derivativePromise = derivative(derivativesConfig)(
+          change,
+          context
         );
-        promises = sparkPromises;
-      } catch (err) {}
+        promises.push(derivativePromise);
+      }
+      // const propagateChanges = propagateChangesOnTrigger(change,triggerType);
+      // promises.push(propagateChanges);
+
       try {
-        if (triggerType !== "delete") {
-          const derivativePromise = derivative(derivativesConfig)(
-            change,
-            context
-          );
-          promises.push(derivativePromise);
-        }
-      } catch (err) {}
-      await Promise.all(promises);
+        const result = await Promise.allSettled(promises);
+        console.log(result);
+      } catch (err) {
+        console.log(`caught error: ${err}`);
+      }
     }),
 };
diff --git a/FT_functions/functions/src/propagates/SourceFns.ts b/FT_functions/functions/src/propagates/SourceFns.ts
new file mode 100644
index 00000000..fc2fd228
--- /dev/null
+++ b/FT_functions/functions/src/propagates/SourceFns.ts
@@ -0,0 +1,70 @@
+import { DocumentSnapshot } from "firebase-functions/lib/providers/firestore";
+import { rowReducer } from "../utils";
+const TARGET_SUB_COLLECTION = "_FT_TARGETS";
+
+//sample target sub document
+
+// {collection**}/
+/**
+ 
+{
+    targetRef:'test/id'
+    targetFieldKey:'fieldKey'
+    trackedFields:[]
+}
+ */
+
+// source changes Trigger
+
+// check and propagate any tracked changes to
+export const propagateChanges = (docSnapshot: DocumentSnapshot) =>
+  docSnapshot.ref
+    .collection(TARGET_SUB_COLLECTION)
+    .get()
+    .then((queryResult) => {
+      queryResult.docs.map(async (doc) => {
+        const { targetRef, targetFieldKey, trackedFields } = doc.data() as {
+          targetRef: FirebaseFirestore.DocumentReference;
+          targetFieldKey: string;
+          trackedFields: string[];
+        };
+        const targetDoc = await targetRef.get();
+        if (!targetDoc.exists) return false;
+        const targetFieldValue = targetDoc.get(targetFieldKey);
+        const indexOfCurrentTarget = targetFieldValue.findIndex(
+          (element) => element.docPath === docSnapshot.ref.path
+        );
+        if (indexOfCurrentTarget > -1) {
+          targetFieldValue[indexOfCurrentTarget].snapshot = rowReducer(
+            trackedFields,
+            docSnapshot.data()
+          );
+          await targetRef.update({ [targetFieldKey]: targetFieldValue });
+          return true;
+        } else return false;
+      });
+    });
+
+// when deleting a document all snapshot copies of it in
+export const removeCopiesOfDeleteDoc = (
+  sourceDocRef: FirebaseFirestore.DocumentReference
+) =>
+  sourceDocRef
+    .collection(TARGET_SUB_COLLECTION)
+    .get()
+    .then((queryResult) => {
+      queryResult.docs.map(async (doc) => {
+        const { targetRef, targetFieldKey } = doc.data() as {
+          targetRef: FirebaseFirestore.DocumentReference;
+          targetFieldKey: string;
+        };
+        const targetDoc = await targetRef.get();
+        const currentTargetFieldValue = targetDoc.get(targetFieldKey);
+        const newTargetFieldValue = currentTargetFieldValue.filter(
+          ({ docPath }: { docPath: string; snapshot: any }) =>
+            docPath !== sourceDocRef.path
+        );
+        await targetRef.update({ [targetFieldKey]: newTargetFieldValue });
+        await doc.ref.delete();
+      });
+    });
diff --git a/FT_functions/functions/src/propagates/TargetFns.ts b/FT_functions/functions/src/propagates/TargetFns.ts
new file mode 100644
index 00000000..9c320077
--- /dev/null
+++ b/FT_functions/functions/src/propagates/TargetFns.ts
@@ -0,0 +1,48 @@
+import { db } from "../firebaseConfig";
+const TARGET_SUB_COLLECTION = "_FT_TARGETS";
+
+//sample target sub document
+
+// {collection**}/
+/**
+ 
+{
+    targetRef:'test/id'
+    targetFieldKey:'fieldKey'
+    trackedFields:[]
+}
+ */
+
+// Target changes Trigger
+
+// add propagation reference from source subcollection
+export const addTargetRef = (
+  targetRef: FirebaseFirestore.DocumentReference,
+  sourceDocPath: string,
+  targetFieldKey: string,
+  trackedFields
+) =>
+  db
+    .collection(`${sourceDocPath}/${TARGET_SUB_COLLECTION}`)
+    .add({ targetRef, targetFieldKey, trackedFields });
+
+// remove propagation reference from source subcollection
+export const removeTargetRef = (
+  targetRef: FirebaseFirestore.DocumentReference,
+  sourceDocPath: string
+) =>
+  db
+    .collection(`${sourceDocPath}/${TARGET_SUB_COLLECTION}`)
+    .where("targetRef", "==", targetRef)
+    .get()
+    .then((queryResult) => queryResult.docs.map((doc) => doc.ref.delete()));
+
+// removes all references of deleted targets
+export const removeAllReferencesOnTargetDelete = (
+  targetDocRef: FirebaseFirestore.DocumentReference
+) =>
+  db
+    .collectionGroup(TARGET_SUB_COLLECTION)
+    .where("targetRef", "==", targetDocRef)
+    .get()
+    .then((queryResult) => queryResult.docs.map((doc) => doc.ref.delete()));
diff --git a/FT_functions/functions/src/propagates/index.ts b/FT_functions/functions/src/propagates/index.ts
new file mode 100644
index 00000000..267d6060
--- /dev/null
+++ b/FT_functions/functions/src/propagates/index.ts
@@ -0,0 +1,17 @@
+import * as functions from "firebase-functions";
+import { propagateChanges, removeCopiesOfDeleteDoc } from "./SourceFns";
+
+export const propagateChangesOnTrigger = (
+  change: functions.Change<functions.firestore.DocumentSnapshot>,
+  triggerType: "delete" | "create" | "update"
+) => {
+  switch (triggerType) {
+    case "update":
+      return propagateChanges(change.after);
+    case "delete":
+      return removeCopiesOfDeleteDoc(change.before.ref);
+    case "create":
+    default:
+      return new Promise(() => false);
+  }
+};
diff --git a/FT_functions/functions/src/utils/index.ts b/FT_functions/functions/src/utils/index.ts
index ee0a69df..97f74f65 100644
--- a/FT_functions/functions/src/utils/index.ts
+++ b/FT_functions/functions/src/utils/index.ts
@@ -46,6 +46,13 @@ export const getTriggerType = (change) =>
     ? "create"
     : "delete";
 
+export const rowReducer = (fieldsToSync, row) =>
+  fieldsToSync.reduce((acc: any, curr: string) => {
+    if (row[curr] !== undefined && row[curr] !== null)
+      return { ...acc, [curr]: row[curr] };
+    else return acc;
+  }, {});
+
 export default {
   getSecret,
   hasRequiredFields,