1. Starting from the screen you show, select “preset library” in the bottom right of the screen (note that B is already selected). Select the desired type of effect and the algorithm in the box above “preset library”. See current presets for that algo in the middle of the screen. Audition presets to find preset closest to the effect you want and select “parameters” in the bottom left of screen. Modify preset B and A parameters as desired (optionally (re)naming the program) and save preset(s) and/or program as desired.
2. To swap out either preset A and/or B, select the name of the preset you want to change near the top of the screen. Then follow the instructions above.