Start by creating a product called something like "Remaining Amount", "Partial Payment", or similar. Set it to "Inventory management disabled".
Example of use:
Customer needs to pay for 2 products, in total 9,500 kr. and needs to pay 2,500 in cash and the remaining 7,000 kr. via e-conomic invoice (so they pay later, e.g. bank transfer)
We have the sale in the POS with the 2 products and the total amount.
On top of that, we add our "Outstanding amount/partial payment" product with a negative amount, so 7,000 kr. gets deducted. This means there's 2,500 kr. left to pay in cash.
Then we press "Pay" and "Cash". Now the customer has paid the 2,500 kr. in cash (could also have used card/MobilePay)
There's still a payment missing for the last 7,000 kr., which will be paid later. So we create the following, where we've added a line with 7,000 kr. and added the customer it concerns:
We then press "Pay" and choose "e-conomic invoice".
Now we're done and the customer has paid 2,500 kr. in cash for the first sale and a new invoice has been created in e-conomic for the rest for the second sale.
