How to make a separate invoicing for 2020-21, such that i can access old invoices also when required?

Hi nashik-efabs, thanks for reaching out. We request you to create an invoice and change the Invoice number manually as 2020-2021/001 for one invoice and it would take the next number automatically as 2020-2021/002. It helps you to bifurcate the invoices of last financial year and this financial year.