diff --git a/server/integrations/partsManagement/partsManagement.queries.js b/server/integrations/partsManagement/partsManagement.queries.js
index 45a88ad58..e0ba6088c 100644
--- a/server/integrations/partsManagement/partsManagement.queries.js
+++ b/server/integrations/partsManagement/partsManagement.queries.js
@@ -32,9 +32,76 @@ const INSERT_JOB_WITH_LINES = `
   }
 `;
 
+const GET_JOB_BY_CLAIM = `
+  query GetJobByClaim($shopid: uuid!, $clm_no: String!) {
+    jobs(
+      where: { shopid: { _eq: $shopid }, clm_no: { _eq: $clm_no } }
+      order_by: { created_at: desc }
+      limit: 1
+    ) {
+      id
+    }
+  }
+`;
+
+const UPDATE_JOB_BY_ID = `
+  mutation UpdateJobById($id: uuid!, $job: jobs_set_input!) {
+    update_jobs_by_pk(pk_columns: { id: $id }, _set: $job) {
+      id
+    }
+  }
+`;
+
+const UPSERT_JOBLINES = `
+  mutation UpsertJoblines($joblines: [joblines_insert_input!]!) {
+    insert_joblines(
+      objects: $joblines
+      on_conflict: {
+        constraint: joblines_jobid_line_no_unq_seq_key
+        update_columns: [
+          status
+          line_desc
+          part_type
+          part_qty
+          oem_partno
+          db_price
+          act_price
+          mod_lbr_ty
+          mod_lb_hrs
+          lbr_op
+          lbr_amt
+          notes
+        ]
+      }
+    ) {
+      affected_rows
+    }
+  }
+`;
+const DELETE_JOBLINES_BY_JOBID = `
+  mutation DeleteJoblinesByJobId($jobid: uuid!) {
+    delete_joblines(where: { jobid: { _eq: $jobid } }) {
+      affected_rows
+    }
+  }
+`;
+
+const INSERT_JOBLINES = `
+  mutation InsertJoblines($joblines: [joblines_insert_input!]!) {
+    insert_joblines(objects: $joblines) {
+      affected_rows
+    }
+  }
+`;
+
 module.exports = {
   GET_BODYSHOP_STATUS,
   GET_VEHICLE_BY_SHOP_VIN,
   INSERT_OWNER,
-  INSERT_JOB_WITH_LINES
+  INSERT_JOB_WITH_LINES,
+  GET_JOB_BY_CLAIM,
+  UPDATE_JOB_BY_ID,
+  DELETE_JOBLINES_BY_JOBID,
+  UPSERT_JOBLINES,
+  INSERT_JOBLINES
 };
diff --git a/server/integrations/partsManagement/partsManagementVehicleDamageEstimateAddRq.js b/server/integrations/partsManagement/partsManagementVehicleDamageEstimateAddRq.js
index 1ab8e4e64..ea3803725 100644
--- a/server/integrations/partsManagement/partsManagementVehicleDamageEstimateAddRq.js
+++ b/server/integrations/partsManagement/partsManagementVehicleDamageEstimateAddRq.js
@@ -9,7 +9,11 @@ const {
   GET_BODYSHOP_STATUS,
   GET_VEHICLE_BY_SHOP_VIN,
   INSERT_OWNER,
-  INSERT_JOB_WITH_LINES
+  INSERT_JOB_WITH_LINES,
+  GET_JOB_BY_CLAIM,
+  UPDATE_JOB_BY_ID,
+  INSERT_JOBLINES,
+  DELETE_JOBLINES_BY_JOBID
 } = require("./partsManagement.queries");
 
 // Defaults
@@ -436,6 +440,18 @@ const extractJobLines = (rq) => {
   });
 };
 
+/**
+ * Checks if the request is a supplement or a document portion delta.
+ * TODO: This is a temporary check, should be replaced with a proper field in the XML.
+ * @param rq
+ * @returns {boolean}
+ */
+const isSupplement = (rq) => {
+  const docStatus = rq.DocumentInfo?.DocumentStatus;
+  const historyType = rq.RepairTotalsHistory?.HistoryTotalType;
+  return docStatus === "S" || historyType === "DocumentPortionDelta";
+};
+
 /**
  * Finds an existing vehicle by shopId and VIN.
  * @param {string} shopId - The bodyshop UUID.
@@ -458,6 +474,26 @@ const findExistingVehicle = async (shopId, v_vin, logger) => {
   return null;
 };
 
+/**
+ * Finds an existing job by shopid and claim number.
+ * @param shopid
+ * @param clm_no
+ * @param logger
+ * @returns {Promise<*|null>}
+ */
+const findExistingJob = async (shopid, clm_no, logger) => {
+  try {
+    const { jobs } = await client.request(GET_JOB_BY_CLAIM, {
+      shopid,
+      clm_no
+    });
+    return jobs?.[0] || null;
+  } catch (err) {
+    logger.log("parts-job-fetch-failed", "warn", null, null, { error: err });
+    return null;
+  }
+};
+
 /**
  * Inserts an owner and returns the owner ID.
  * @param {object} ownerInput - The owner data to insert.
@@ -532,6 +568,21 @@ const partsManagementVehicleDamageEstimateAddRq = async (req, res) => {
     const joblinesData = extractJobLines(rq);
     const insuranceData = extractInsuranceData(rq);
 
+    // Uncomment for debugging
+    // console.dir(
+    //   {
+    //     joblinesData,
+    //     lossInfo,
+    //     insuranceData,
+    //     vehicleData,
+    //     ownerData,
+    //     adjusterData,
+    //     repairFacilityData,
+    //     estimatorData
+    //   },
+    //   { depth: null }
+    // );
+
     // Find or create relationships
     const ownerid = await insertOwner(ownerData, logger);
     const vehicleid = await findExistingVehicle(shopId, vehicleData.v_vin, logger);
@@ -577,6 +628,36 @@ const partsManagementVehicleDamageEstimateAddRq = async (req, res) => {
       joblines: { data: joblinesData }
     };
 
+    // Check if this is a supplement or document portion delta.
+    if (isSupplement(rq)) {
+      console.log("----------------------IS SUPPLEMENT----------------------");
+      const existingJob = await findExistingJob(shopId, clm_no, logger);
+      if (existingJob) {
+        const { joblines, ...jobWithoutLines } = jobInput;
+
+        await client.request(UPDATE_JOB_BY_ID, {
+          id: existingJob.id,
+          job: jobWithoutLines
+        });
+
+        await client.request(DELETE_JOBLINES_BY_JOBID, {
+          jobid: existingJob.id
+        });
+
+        if (joblines?.data?.length) {
+          const joblinesWithJobId = joblines.data.map((line) => ({
+            ...line,
+            jobid: existingJob.id
+          }));
+
+          await client.request(INSERT_JOBLINES, { joblines: joblinesWithJobId });
+        }
+
+        logger.log("parts-job-updated", "info", existingJob.id);
+        return res.status(200).json({ success: true, jobId: existingJob.id });
+      }
+    }
+
     // Insert job
     const { insert_jobs_one: newJob } = await client.request(INSERT_JOB_WITH_LINES, { job: jobInput });
     logger.log("parts-job-created", "info", newJob.id, null);