The code in Solution 11328674 would help. As an alternative if you're using IC617 ISR5 or later (I would be wary using these new functions in an earlier version because there were some incompatible changes made in that hotfix release to fix some earlier errors since they were introduced in IC617), there are the new "abeLayer" functions (e.g. abeLayerAnd) which handle hierarchy. Note that whilst these are named a lot like my functions (I use the prefix "ab"), they are actually for the "advanced boolean engine". Regards, Andrew.
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