I would like to see a more flexible way of setting discounts and surcharges.

When adding discounts/additional costs or other surcharges, you should be able to choose which services or service groups of the contract/offer they should apply to.

I also find it clumsy that when setting several surcharges, the fee, including the first surcharges, is used as the basis for calculation for the subsequent surcharges.

So if 5% additional costs are added to a project and an additional 3% for project management costs, the 3% is calculated from 105% of the order amount. However, in my opinion, this should also relate to 100% of the order amount.