Steps for placing an Insert Assembly Copy:
On the Home tab in the Clipboard group, choose the Insert Assembly command.
Note:
A coordinate system is used to position the insert assembly copy. If a coordinate system in the active assembly doesn’t exist at the placement point, a new coordinate system will need to be created at the location required to place the insert assembly copy. See the help topic Coordinate System command.
Set the options required to place the insert assembly copy. See the help topic Insert assembly copy options.
Click OK.