Disregard that question - I figured it out. This sequencer keeps amazing me!
If anyone else hasn't figured it out:
On your target track (the one with the notes you want to play), open the mode menu. Set mode to 'normal', select a bus, and change STrg to 'on'.
On your 'step' track (the one to advance the steps of the target track), open the event menu. Select the bus you specified for the target track. Now any steps you enter in edit mode will cause the sequencer of the target track to advance a step.