In the attached part (in SW 2013) when I try to Extrude Cut the "runner groove", I only have a "Through all" choice and no "Blind". Why is this the case?
I drew the part originally as the LH side of a drawer with no problem. But when I deleted the original runner groove sketch and re-drew it on the other side to produce the RH drawer side, the' problem occurs..
I suspect that the problem is modifying the original part. I recognise I could simply draw the new part from scratch but I want to know why there is a problem now.