Hi
yes, Help File:
football1_ : Market Variables > Prefixes for Cross-Market Betting
s_ : Selection Variables > Referring to selections by their index
r_ : Selection Variables > Referring to selections sorted by price
so an example of putting them together:
if you want to check back price of Under in OU2.5
OU2.5 cross-market prefix is: football8_
Under is selection index 1 : s_1_
back price is : back_price
football8_s_1_back_price
and selections trigger expression football8_s_1_back_price is less than 3.00