My help is unpaid and I think the results will be satisfying.

Create a dummy Clearing Bank Account.

Record each invoice as paid using the check number for the group.

Deposit the Undeposited Funds resulting from Received Payments into the clearing account.

Now make a single bank transfer from clearing to your operating account.

If you need to batch this check with others you can "clear" the clearing account to Undeposioted Funds and then include this record of the check in a following deposit