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I'm not sure I understand your problem.
The general functionality of PPM is, you select a responsible role, and then all stuffed resources will be available in the drop-down "Responsible Resource". If you choose not to select one, then all the resources stuffed to the role will appear concatenated in the "Responsible" field bellow. This is how it works on our system, but I'm not sure if this was enhanced or is it standard functionality.
Try to see if you staff a resource for the "Product Technical Advisor (PTA)" and select it as a "
"Responsible Resource", if the "Responsible" fields is filled.
If not, I'll have a look how we did it. Nevertheless, it's definitely possible!
Tudor