as I want on single button that is On Clicking Main Button Dropdown should open like Area 1 and Area 2 and Clicking on Area 1 another Dropdown should open for Sub Areas i.e., Sub Area A and Sub Area B and then Clicking on Sub Area it should Perform any action like Open display, acknowledge etc. and same goes for Area 2, For your Reference the see the below Chart
As we want to use Combo Box for this, is this possible in Tatsoft?