RBE3
RBE3's are interpolation constraint elements, where the motion of a dependent node is defined as the weighted average of the motions of a group of independent nodes.
Create RBE3 Elements
Use the RBE3s tool to create elements.
Update RBE3 Elements
Use the Entity Editor to update RBE3 elements.
This includes: modifying the independent and dependent node(s) selection, modifying the DOF, where applicable for the solver, and recalculating the independent node location.