Create an invoice management workflow

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workflow

nintex

Hello,

I want to do a simple nintex workflow to manage invoices. the idea is the following:

first list with invoices

+-----------+-----------+--------+
| Invoice | PO Number | Amount |
+-----------+-----------+--------+
| Invoice 1 | 1234 | 25 |
| Invoice 2 | 1234 | 25 |
| Invoice 3 | 6789 | 50 |
| Invoice 4 | 6789 | 50 |
+-----------+-----------+--------+

second list with PO

+-----------+-------+----------+
| PO Number | Total | Reminder |
+-----------+-------+----------+
| 1234 | 100 | ? |
| 6789 | 200 | ? |
+-----------+-------+----------+

i want my workflow to calculate the reminder. After quite some search i cannot find a detailed explanation on how to do this using in nintex workflow.

Thank you very much for your help