The partial service function and partial benefit templates can also be used to store non-HOAI services (e.g. preliminary studies, etc.) with partial services. However, this is currently not possible (unlike the HOAI calculator) in the offer itself, but only in the contract structure. In the context menu of a service, it should be possible to select a partial service template or create an individual partial service table just as from the contract structure:

So far, I have had to create a service in the offer and bill it according to the level of benefit.

However, I can only change the performance status method from the default manual method to partial service in the contract structure later

... and can only enter my services there, which I have already described in the offer.

And only after I've put the offer into a contract...

In addition, the placeholder %PART_PHASE_DESCRIPTION% cannot be used in the offer.