diff --git a/src/apps/companies/constants.js b/src/apps/companies/constants.js
index ed1f0709a91..9c8a86d8e77 100644
--- a/src/apps/companies/constants.js
+++ b/src/apps/companies/constants.js
@@ -5,6 +5,7 @@ const QUERY_FIELDS_MAP = {
   archived: 'archived',
   name: 'name',
   sectorDescends: 'sector_descends',
+  subSectorDescends: 'sub_sector_descends',
   country: 'country',
   ukRegion: 'uk_region',
   headquarterType: 'headquarter_type',
diff --git a/src/modules/search/services.js b/src/modules/search/services.js
index da16eff766b..0ef1d97cf2e 100644
--- a/src/modules/search/services.js
+++ b/src/modules/search/services.js
@@ -26,6 +26,19 @@ const buildOptions = (isAggregation, searchUrl, body, entity) => {
   }
 }
 
+const mergeSectorAndSubSectorParams = (requestBody) => {
+  const { sub_sector_descends, sector_descends, ...reqBody } = requestBody
+  const mergedSectors = [
+    ...(sector_descends ? sector_descends : []),
+    ...(sub_sector_descends ? sub_sector_descends : []),
+  ]
+
+  return {
+    ...reqBody,
+    sector_descends: mergedSectors,
+  }
+}
+
 function search({
   req,
   searchTerm: term = '',
@@ -68,7 +81,7 @@ function exportSearch({ req, searchTerm = '', searchEntity, requestBody }) {
   if (searchEntity == 'investment_project') {
     transformedRequestBody = transformLandDateFilters(requestBody)
   } else {
-    transformedRequestBody = requestBody
+    transformedRequestBody = mergeSectorAndSubSectorParams(requestBody)
   }
   const searchUrl = `${config.apiRoot}/${apiVersion}/search`
   // If the requested CSV export should contain policy feedback, we need to call
@@ -125,4 +138,5 @@ module.exports = {
   exportSearch,
   searchAutocomplete,
   searchDnbCompanies,
+  mergeSectorAndSubSectorParams,
 }