hi
r_1_bm_backa = rank 1 bm_backa , so change the 1 to 2 etc
s_1_bm_backa = selection index 1 bm_backa , change the 1 to 2 etc
but if you are going to use the back amount in another trigger as a bet amount , you only need to type bm_backa in the amount box.
mcbee