You can carry over a balance from a previous invoice to a new invoice, by enabling the option when you're editing and or generating the invoice (at the bottom of the screen). 

Just switch "Add all unpaid balances to this invoice" to "Yes". 

What happens now? 

The previous balance(s) will reflect on your new invoice, and the total outstanding amount will be the sum of all your previously owed balance(s), plus the total on your new invoice. 


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