Trestle System
Unlock all 4 locking mechanisms and completely slide out the outer frames. You now have a centre section (first trestle) and 2 outer frames.
To form the second trestle, position the two outer frames so that they are facing the same direction.
Pull out and lock the J-hinge from one side of the outer frame into the other frame hole. Repeat on the other side.
Please note that the second trestle cannot be use as a ladder.