Both the Intensities and BodyBlasts had a "mix and match" feature in the menu. You would select the chapter you want to go to from that menu, then when complete, it would return you back to the "mix and match" menu. I think this feature may be also in the recent High Step workouts.
If you mean the workout "blender", that was only on the BodyBlast Series. You could program up to six chapters in a workout to play consecutively. It doesn't work across the DVD though. So you can't program in a leg sequence from L&G, followed by a combo of KPC.
Diane