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Thanx for the reply..
Can i draw the square hole using wire on the layer 20imension..
would it be ok ?
You can do almost anything provided you make sure the PCB manufacturer understands what you want (i.e. you supply them with notes to explain it). I have seen people put four holes on a PCB with a note to route out the area between them. The advantage of using layers such as 46 is that the PCB will "look" correct and there will be some consistency. For example, my normal PCB supplier will take Eagle files so even if I don't add any notes they know what to do with a rectangle drawn on layer 46.
Keith.