Left & Right Configs

i must be missing or doing something wrong b/c i was toldthis can be done: within the same part, i want to have a left sideand a right side as two configs for two different parts #'s. theright is mirrored, so when i have to update my sides, i only haveto do it to the left, and the right comes with it b/c its mirrored.here is what i do: open new part.sketch a 200x100mm rectangle onthe right plane. extrude it 16mm backwards (so the right plane isthe inside face of my side). add a 10mm in diameter hole (anywhere)thru all on face (right plane)add a 15mm in diameter hole(anywhere) thru all on facename this config "left"add anotherconfig named "right"insert a mirrored body in the right configgo tothe "left" config - suppress the mirrored body.go to the "right"config - and suppress the Extrude1 - which is the left side.butwhen i do this, everything is suppressed b/c its mirrored. so i amin essence, mirroring nothing -- so both bodies "disappear" fromthe screen.I am obviously missing or doing something wrong, butwhat? How can I create a left side -- Mirror it for a right -- Havetwo configs so i can have two seperate part #'s -- And have twoseperate drawings for both configs -- And then when I need torevise my left, I only have to do it to the left and the rightautomatically updates b/c it ismirrored??????????!!!!!!!!!!!!!!!!!!!!!!I am confused!HELP!!!!!!SolidworksGeneral