Hello, i'm new in the world of solidworks and i have a stupid question. I have made the base of a folding box, i try to close the box but i can't fold the base flange, the principal part of this box, when i go to make a line e selet a portion of the base, the software select all the base and i can't fold it. Can you help me? thank you

p.s. i don't know if is the right category, sorry