i tryed and googled for hours but couldn't find a solution that works.
I want to remove the gold part as sown below, the gold mesh and the pink ones are different object
remove the intersection (red signed)
thanks a lot for the help!
You could join the 2 objects into one, select the hat mesh in Edit mode, go into the Face panel > Intersect (Knife):
Separate the hat with P, select the edge loop the intersect operation has created, press VEnter to rip:
Remove this part: