editing a part in assembly won't reflect on the part file

-i have an assembly file i did some holes in one part of this assmebly, however when i separtely opened that part, I didn't find

the changes i made.

- My next question is why one couldn't make a boss/extrude in assembly document, only cut extrude is available

thank u

Eng. Samy youssef

SolidworksAssemblies