Is there any way to give manual number of billing invoice and same in AR

Summary:

Hi Folks,

As our customer is implementing Project billing for the first time, they already have AR invoices created for these billing transactions. Now I am creating the billing invoices and transferring them from Project billing to AR in bulk, I wanted to have the same old invoice number in both Project billing and AR invoices.

Please suggest a best way to do this exercise.

Regards,

Shubham