Sage 300: Payment Batch Entry - Able to Leave Transactions.

Create Payment Batch
Select Vendor
Create Payment Entry
Select the invoices to be paid.
(In my case, it could be over 100 invoices for one vendor)
(need to leave page, but you do not want to loose the invoices already selected for payment)
Option to save but not add.
This would allow you to pick up where you left off.
Once payment is ready, then select add.