Assign Node Relationships dialog
This dialog is used to define a constraint relationship between a "control" node and subsequent "dependent" nodes.
A "control node" is one which is linked to its "dependent nodes" by one or more degrees of freedom. This defines a multi-point constraint condition. For example, a rigid link (dependent displacement and rotation) or displacement typing (e.g., beams which lie in different planes but are tied vertically). This is a more generalized method of linking nodes together than a floor diaphragm.