Show categories depending on the package chosen ads.

I’m working on the creation of two ad packages with the Theme Directory.

For example:

Ad Package 1: You can belong to Category 1 only.

Ad Package 2: You can belong to Category 2 and Category 3.

The problem is that the form of both package show me all categories. An announcement of the package one user can not enter in Category 2 and Category 3 now shows me the three categories in the form Ad Package 1 and Package 2 ads.

I contact for support and chat with have told me that option is not available in Directory-Theme. But I can do programming in the class_core.php file

I would detect that ad package has executed the user and if for example executed Pack 1 ads not allow viewing of Category 2 and Category 3 in this package.

Someone has done something similar or is willing to guide me to how to do?

The first thing I think I have to do is detect that form is open.

Thank you.