diff --git a/app/services/return-requirements/fetch-existing-requirements.service.js b/app/services/return-requirements/fetch-existing-requirements.service.js
new file mode 100644
index 0000000000..c2a4a28db8
--- /dev/null
+++ b/app/services/return-requirements/fetch-existing-requirements.service.js
@@ -0,0 +1,151 @@
+'use strict'
+
+/**
+ * Fetches existing return requirements to be copied from
+ * @module FetchExistingRequirementsService
+ */
+
+const ReturnVersionModel = require('../../models/return-version.model.js')
+
+const FREQUENCIES = {
+  day: 'daily',
+  week: 'weekly',
+  fortnight: 'fortnightly',
+  month: 'monthly',
+  quarter: 'quarterly',
+  year: 'yearly'
+}
+
+/**
+ * Fetches existing return requirements to be copied from
+ *
+ * In the returns setup journey we allow users to select the option to create new requirements by copying from them
+ * from an existing return version. This service fetches the selected return version and its requirements
+ *
+ * @param {string} returnVersionId - The UUID of the selected return version to copy requirements from
+ *
+ * @returns {Promise<Object>} The return version and its linked return requirements, plus their points and purposes
+ */
+async function go (returnVersionId) {
+  const returnVersion = await _fetch(returnVersionId)
+
+  return _transformForSetup(returnVersion)
+}
+
+async function _fetch (returnVersionId) {
+  return ReturnVersionModel.query()
+    .findById(returnVersionId)
+    .select([
+      'id'
+    ])
+    .withGraphFetched('returnRequirements')
+    .modifyGraph('returnRequirements', (builder) => {
+      builder.select([
+        'id',
+        'abstractionPeriodEndDay',
+        'abstractionPeriodEndMonth',
+        'abstractionPeriodStartDay',
+        'abstractionPeriodStartMonth',
+        'collectionFrequency',
+        'fiftySixException',
+        'gravityFill',
+        'reabstraction',
+        'returnsFrequency',
+        'siteDescription',
+        'summer',
+        'twoPartTariff'
+      ])
+    })
+    .withGraphFetched('returnRequirements.returnRequirementPoints')
+    .modifyGraph('returnRequirements.returnRequirementPoints', (builder) => {
+      builder.select([
+        'id',
+        'naldPointId'
+      ])
+    })
+    .withGraphFetched('returnRequirements.returnRequirementPurposes')
+    .modifyGraph('returnRequirements.returnRequirementPurposes', (builder) => {
+      builder.select([
+        'id',
+        'purposeId'
+      ])
+    })
+}
+
+function _transformForSetup (returnVersion) {
+  const { returnRequirements } = returnVersion
+
+  return returnRequirements.map((returnRequirement) => {
+    const {
+      abstractionPeriodEndDay,
+      abstractionPeriodEndMonth,
+      abstractionPeriodStartDay,
+      abstractionPeriodStartMonth,
+      collectionFrequency,
+      returnsFrequency,
+      returnRequirementPoints,
+      returnRequirementPurposes,
+      siteDescription,
+      summer
+    } = returnRequirement
+
+    return {
+      points: _points(returnRequirementPoints),
+      purposes: _purposes(returnRequirementPurposes),
+      returnsCycle: summer ? 'summer' : 'winter-and-all-year',
+      siteDescription,
+      abstractionPeriod: {
+        'end-abstraction-period-day': abstractionPeriodEndDay,
+        'end-abstraction-period-month': abstractionPeriodEndMonth,
+        'start-abstraction-period-day': abstractionPeriodStartDay,
+        'start-abstraction-period-month': abstractionPeriodStartMonth
+      },
+      frequencyReported: FREQUENCIES[returnsFrequency],
+      frequencyCollected: FREQUENCIES[collectionFrequency],
+      agreementsExceptions: _agreementExceptions(returnRequirement)
+    }
+  })
+}
+
+function _agreementExceptions (returnRequirement) {
+  const { fiftySixException, gravityFill, reabstraction, twoPartTariff } = returnRequirement
+  const agreementsExceptions = []
+
+  if (fiftySixException) {
+    agreementsExceptions.push('56-returns-exception')
+  }
+
+  if (gravityFill) {
+    agreementsExceptions.push('gravity-fill')
+  }
+
+  if (reabstraction) {
+    agreementsExceptions.push('transfer-re-abstraction-scheme')
+  }
+
+  if (twoPartTariff) {
+    agreementsExceptions.push('two-part-tariff')
+  }
+
+  if (agreementsExceptions.length === 0) {
+    agreementsExceptions.push('none')
+  }
+
+  return agreementsExceptions
+}
+
+function _points (returnRequirementPoints) {
+  return returnRequirementPoints.map((returnRequirementPoint) => {
+    return returnRequirementPoint.naldPointId.toString()
+  })
+}
+
+function _purposes (returnRequirementPurposes) {
+  return returnRequirementPurposes.map((returnRequirementPurpose) => {
+    return returnRequirementPurpose.purposeId
+  })
+}
+
+module.exports = {
+  go
+}
diff --git a/app/services/return-requirements/submit-existing.service.js b/app/services/return-requirements/submit-existing.service.js
index 2d4c4be65f..66c63f4801 100644
--- a/app/services/return-requirements/submit-existing.service.js
+++ b/app/services/return-requirements/submit-existing.service.js
@@ -7,6 +7,7 @@
 
 const ExistingPresenter = require('../../presenters/return-requirements/existing.presenter.js')
 const ExistingValidator = require('../../validators/return-requirements/existing.validator.js')
+const FetchExistingRequirementsService = require('./fetch-existing-requirements.service.js')
 const SessionModel = require('../../models/session.model.js')
 
 /**
@@ -30,6 +31,10 @@ async function go (sessionId, payload) {
   const validationResult = _validate(payload, session)
 
   if (!validationResult) {
+    const existingReturnRequirements = await FetchExistingRequirementsService.go(payload.existing)
+    console.log('🚀 ~ go ~ existingReturnVersion:', existingReturnRequirements)
+    await _save(session, existingReturnRequirements)
+
     return {}
   }
 
@@ -43,6 +48,12 @@ async function go (sessionId, payload) {
   }
 }
 
+async function _save (session, existingReturnRequirements) {
+  session.requirements = existingReturnRequirements
+
+  return session.$update()
+}
+
 function _validate (payload, session) {
   const { licence: { returnVersions } } = session