Determine which tab is active from the controller

Question

Good Morning (or afternoon). I have a form that contains several tabs (organized sections) and then an edit button. What I want to do is, EDIT the information based on the active tab (Tombstone/Sales/Dates). How do I pass to the controller the active tab and then redirect to the proper Template?

Section to Edit

I hope you can see the link. I was not able to add an attachment.