How I can match between Project Contract line Number and Project Invoice Line number at the Invoice

Dears,

Currently, we are addressing a concern raised by the customer regarding the relationship between contract line numbers and invoice line numbers on project invoices — especially in cases where the invoices contain a large number of lines.

The customer would like to understand the concept of matching or aligning contract line numbers with invoice line numbers on project invoices. Specifically, they want to know:

Whether it is possible to arrange or match the contract line number with the invoice line number, and

If it is applicable, how can this be achieved in the project billing process?

If such a direct matching is