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Re: Voids in Concrete Beams
The original question was specifically about voids. You cannot do "in-place" and cut a beam like that. You have to locate the void inside the beam family.
A better option to make openings on the fly is by using the new "Opening by Face" tool. Use voids in the family (and perhaps parameterize them) only if you have a lot of repetition, such as if you're creating the same beam over and over and it has the same opening/s, or you're doing a castellated/cellular beam, etc.