You can use the Interaction module to define and manage the following objects:
Mechanical and thermal interactions between regions of a model or between a region of a model and its surroundings.
Analysis constraints between regions of a model.
Connectors between two points of a model or between a point of a model and ground.
Inertia (point mass, rotary inertia, and heat capacitance) on regions of the model.
Cracks on regions of the model.
Springs and dashpots between two points of a model or between a point of a model and ground.