InsertSolid
Mating
The Mating command enables you to position two entities relative one to each other by applying geometrical constraints between the entities that form the solids. Note that when mating solids, it is not necessary to align the reference system of the solid selected as First Entity with that of the solid selected as Second Entity or vice-versa.
The Mating command also enables you to drag and drop an entity partially constrained by a mating constraint to a different position. Both the preview and the final position will be consistent with the existing constraints.
You apply the mating constraint by switching to a new command, by selecting Rebuild All (if you chose the Deferred Mating option), or, if you wish to define a new constraint, by picking a new entity, belonging to the object that will be moved in the mating.
e-Learning on Assemblies and Mating