How to control which AppServer is used for a process?

Hello experts!

We have the problem that we have 3 Servers from which are 2 running at 99% and one has nearly no processes running.

Is it possible to control on which ApplicationServer a process is starting?

I know, there is a possibility for process chains if you go in the menu to process chain->attributes->backround server

But we have learned that this is only true for the starting process. The following processes can run on different servers.

Does anyone know what to do?

Thanks in advance!

Peter