Use the Deposit button in the upper right corner of the Cash Receipts Entry screen to access the Cash Receipts Deposit dialog.  Once there you can make changes to or delete the current Deposit Number, change to another Deposit Number or create a new Deposit Number.

The option to create a new deposit number is shaded.  I can only scroll through existing deposits.

Click the Cancel button and that will clear the current deposit number.  Focus will be on the Deposit Number field and the Next Deposit Number button will be enabled.

You can't create a new Deposit while you have one selected.  Click Cancel first.

Well that was simple!  Thanks for your help!

Issues like this are why I am growing to hate Sage 100.  You literally have to go two steps back to go one step forward.  Literally have to go back to the Cash Receipts Deposit window, cancel the finished deposit, and then create a new deposit number.

Typically you'd do one Deposit with multiple entries.  If the problem is you don't know the combined deposit total for multiple payments, entering that amount can be disabled (AR Options).