Boolean Operations (union, subtract, intersection) etc. Solidworks, Autocad does have but i can't find it in Pro Engineer
I agree with Dusan for assembly, Also within the part one can copy geometry from other part by selecting #Insert #Shared Data then #Copy Geometry or Publish Geometry or Merge/Inheritance. Make sure that the surfaces are copied rather than the solids. Then go for #Edit #Solidify. To either create Cut or Solid part. Hope this helps.