You can copy objects in a matrix model and paste them into the same or another matrix model.
Copy and paste objects
Procedure
The objects are pasted into the matrix model as occurrence copies.
Copy and paste hierarchically grouped objects
Procedure
The hierarchically grouped objects are pasted into the matrix model as occurrence copies.
Tip
Select adjacent objects by holding down the Shift key and clicking the first and last object. You can select objects that are not adjacent by holding down the Ctrl key and clicking the relevant objects. You can extend or reduce your selection using the arrow keys.