Sale invoice for the month Oct 21 and Feb 2022

A business owner needs to revise their GSTR 1 filings for October 2021 and February 2022. This is because sales were made under a proprietorship but the client now requires invoices under a newly formed private limited company for the same period. The delay in payment is causing urgency. Suggestions include amending the GSTR 1 by changing the GSTIN, but caution is advised as amendments can only be made once.