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Bolt connectors do not need a hole in the part, just a circular edge. You could put a circular splitline on your part and "Bolt" it to a virtual wall. The virtual wall being a plane which represents your fixture. You specify the bolt preload as the clamping force you want to use and match the bolt diameter to the stiffness of your clamp. The virtual wall can have a stiffness too. This way you do not explicitly model your clamp or fixture, just the part. You may also need splitlines for the areas of your part that are contacting the virtual wall.