If you have to invoice a certain percentage of a total price in a fixed price model, you can do this in several ways. First, you can define a payment plan in the price model:
In this case we have defined a fixed payment of 100000 NOK at the end of the month of November. Let's imagine that we for liquidity reasons we need to invoice today and not wait until November. In this case you have two options:
Change the date of the payment, and otherwise just leave the payment plan as it is. If that is the case, then you can change the date and just go to "to be invoiced" and invoice normally.
The second option involves going to "to be invoiced" and change this payment directly there:
Either method will allow you to invoice in advance