"simplify" grouped objects?

I'm working on a design to 3d print (case for an off-brand Android tablet)... I've got it looking like I'd like it to however I wanted to print a couple corners alone to check for fit. I made a copy and used some cube holes to get rid of everything but the corners I want but it won't export. As it is working I see it act like it is repeating the last several "cuts" I made before I got to the final design so I'm wondering if that is why? Anyway I was wondering if there was a way for it to "forget" the steps and just simplify the design to the final product of the couple corners I want at this point. TIA for any suggestions!!


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