rtalukdar wrote: ↑Tue Jun 28, 2022 11:06 am I tried doing that. It still gives me the overall surface area. Only when I open one of the parts individually does it allow me to select different sections and give its value.

Works for me:

The problem lies in your sketches for the base. They should be fully constraind, there are lines not parallel which should be.

Edit: Just checked the other parts, same problem there. Try going through a couple of tutorials - at least the basic ones. It will help you at lot.

No issues here either