Uwe,
If you are looking for a way to organize your code, TestStand does have Workspace files. You can add sequences, projects, and code modules to a TestStand workspace for easy reference to the files. You can also associate a process model with a certain sequence file by going to Edit>>Sequence File Properties. On the Model tab you can specify to always use a certain file.
If this doesn't help you, post again with a clarified question.
Thanks!
Shannon R.
Application Engineer
National Instruments