I am looking to put a pushbutton on our IH0 transaction and when a functional location or equipment is selected, use this new pushbutton to create a notification bringing with it the relevant equipment or functional location. Basically, I want the pushbutton to mimic the menu selection a user performs normally. Can you please help with this?

Yes, this is possible. Use the notation:

Pushbutton (toolbar) "Create Notification" "/Menu=3,1,2"