Quote:
Originally Posted by Domtech
Instead of cutting it shorter I just right clicked on "extrusion 1" on the left, selected "edit feature", adjusted the length to what I needed and clicked OK.
Then I deleted hole 1 and hole 2 to clean it up a bit. 
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This is a better method. If I remember correctly the "C" channels are drawn as sheet metal parts that at folded much as they are in real life. Its a much better practice to simply edit the original extrusion or sheet metal feature, rather than add additional sketches or features to the part.