Conditional value list from a many to many relation

I tried looking in the forum but couldn't find anything similar.

I'm having a hard time with creating a value list from a many to many relationship, this is the diagram.

The goal is to have 2 drop down lists,
ddl 1) shows all of the companies
ddl 2) shows the programs that are related to the company selected

I'm not sure how to create the conditional value list, do I have to create a table occurrence? if so, of what table?

This is what the ProgramCompany table looks like


Thank you guys for your time, you're awesome