Original Command Base/ Cab1 hand held operator's manual has all the information for advanced operation, which includes multiple units. Click on the underlined phrase to link, information page 22------- ??
Other features of a lash-up consist.
Front/Rear lights of the consist operate, all other head/tail lights are off.
Front/Rear Couplers operate, not all couplers. The consist operates as one engine.
Engines/Units can be facing backwards as part of the consist.
Legacy shortened/simplified some of the steps, but uses the same key pad inputs.
Original TMCC only allowed for 9 consist numbers. That was extended to 99 with Legacy.
Most unusual feature, IMO. To Break a consist, each engine must be assigned to Train (TR-0)
Have fun, Mike CT. 
