Converting Customer Invoice to Purchase Bill

Converting Customer Invoice to Purchase Bill

Hi,

In my service-based business, I sometimes create the customer invoice first, and later I receive the purchase bill from the vendor for the same job.

Is there any option in Zoho Books to:

  1. Convert a customer invoice into a purchase bill, or

  2. Link/associate a new purchase bill to an already created customer invoice (similar to "Billable" tagging), so that the cost and billing remain connected?

This will help maintain proper tracking between vendor bills and customer invoices.

Is this possible in Zoho Books (Free/Standard version)? If yes, please guide me on the correct workflow.