Hi Lisa!
What I typically do in a situation like this is set the whole transaction up as a Payable Charge to start with. In your transaction entry screen, change the Transaction Type to Payable Charge. Enter the date, supplier, reference, and description. The total should be the amount of the two payments added together. You can then code whatever expense you need to in full.
Once this is done, you can do your two payments separately. For example, the item from your debit card would go in as a withdrawal from your bank account. Instead of using EX, change the type to PP, select the supplier, and put a checkmark on the right of the full invoice and click OK. Record this, then enter the second payment from cash in the same manner.
I hope this helps!
