Hi Neetu,
As mentioned in Docs, you need to implement the ExportToExcelIGeneratedCustomExport interface, it changes to use OfficeIGeneratedWorkbookCustomExporter.
With it, you can customize the menu you need.
Please refer this Docs: [View:https://docs.microsoft.com/en-us/dynamics365/unified-operations/dev-itpro/office-integration/customize-open-office-menu:750:50]
and blog :[View:https://www.d365stuff.co/customdataentityopeninexcel/:750:50]