Hi Kardos,
Perhaps this domain model provides you with some inspiration. The steps you'd have to take could be:
You could opt to calculate and store RequestLine.LinePrice as well to ensure any updates in material prices don't affect existing requests.
Hi Kardos,
If you do not want to store the total or the order items, then you can achieve this with just a couple of entities.
I created 2 flows to increment and decrement the number of requested items.
I called the increment flow on the click of the plus button which sums up the item total and the gross total. The opposite for decrement.