The component cylinder idea works. Thanks so much for figuring this out. I have this problem a lot.

Best,

Ken Harstine

@howard leslie said:

Jim,

Thanks very much for your reply.
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Yes, its a very tricky problem
The main problem is trying to create something that doesn't exist - a hole !!!
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A Possible Workaround
I'm thinking along the lines now of creating the holes as solid cylinders on a layer that can be turned off eg called "Hide" and the main body as a solid rectangle (as before). (Not REALLY solids obviously but you get the idea).
That way you can repeat the holes (cylinders). (Cylinder = Potential Hole if you like).
Once the components length has been defined and cylinders automatically repeated, edit component by selecting all cylinders.
Then use Bool Tools (Thank you Dale) or manually cut out the Holes
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Long Term - possibly add a behaviour to DCs for Holes ??? Is this possible ???
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Just some thoughts anyway

Thanks once again

Howard L'