Currently, PrePoMax supports rigid body constraints that can transfer loads from a reference point to nodes of the model. However, they introduce rigidity to the model. CalculiX also supports kinematic and distributing coupling constraints that transfer loads in more flexible way. They aren’t available in PrePoMax yet so you would have to use the Keyword Editor to add them: RBE3 integration in PrepoMax (Kinematic & Distributing Coupling). They have some limitations too and have to be used carefully.
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