CISCO Router Question

Can you have multiple unique DLCI entries on the same subinterface? The routers are 3600’s and 2600’s running IOS 12.0 and 11.3. The serial interface on the 3600 is a T1 connected to six other fractional T1’s connected to the 2600’s. How would youget each circuit to work on the same interface that way I don’t have to have six different sub interfaces with different IP’s. I thought of adding the DLCI’s of the 6 other circuits to the same subinterface.