Greetings,
The PBT files are stored at: C:\Program Files\Altiris\Deployment\PCT\{your language) - C:\Program Files\Altiris\Deployment\PCT\EN in my case.
When you execute the process it filters out those you don't want. If you want 5 separate captures, you have to execute 5 times on that same machine, with different templates that target the specific users.
Otherwise, all in spec profiles are captured in the same capture file. You can run it separately, otherwise, it is executed as part of the process of cature and after deploy of the new image.