[575] Can this board drive two (2) Y-motors? Design uses 1 X, 2 Y, and 1 Z motor. The schematic has X, Y, Z

You can use this board to have two motors/drivers on a single axis. You have two solutions for this: Wire the YP and TD to two drivers so they are receiving the same pulses and direction signals from the controller (if you need the motors to turn in opposite directions, just swap the A and B coils where the motor connects to the driver for one of the drivers/motors). This will free up an axis on the board. Use the Mach3 slaave axis option where you resolve the two motors on a single axis by software. This will require you to use the extra axis on the board.