When creating a document, you can set prices based on the desired margin. In this way, the price can be adjusted more easily by modifying the margin a little.

For example:

A budget with 20 lines where we want to have a margin of 25% (we can still modify it on some line) and Holded would calculate the sales price to obtain that margin. In addition, it would be easy to modify it in case of negotiation with the client.