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Unable to extrude and remove a sketch through a shape that I have imported
I have recently taken on the task of editing a shape that I have downloaded and imported into this software to test OnShape out. The shape imported fine but has a numerous amount of lines on it and some 3400 surfaces. I don't understand why this is but I have a feeling it is preventing me from removing pieces of the shape. When I make my own shapes, it will extrude and remove perfectly but this imported shape... not so much. Any suggestions? Also the file is a STEP if that means anything to anyone helping out.