The Make Composite Function allows you to create a composite from existing entities.
Using the Function:
Select Make from the Tools>Composite submenu.
You are prompted to name the new composite. Enter a name.
Select the entities you intend to add to the new composite, using the Universal Selection Menu. The composite is then made, and given the name you had assigned to it.
Once the entities have been selected, you are prompted to enter a name for the next composite to be made. If you do not wish to create another composite, simply select ESCAPE.