To settle sales invoice with purchase invoice created for the same party, first you need to link the customer and vendor.
Kindly refer to the steps mentioned in the article link shared below to link customer with the vendor:
Once the customer and vendor is linked, please follow the steps mentioned below to settle the sales invoice with the purchase invoice:
Step 1: Go to Bills >> Click on More.
Step 2: Click on Record Payment.
Step 3: Click on Use Advance Payments to Settle.
Step 4: Enter the amount that you want to settle >> Click on Record.



