Stacking in NFL

[megamax617]

Evening! Amazing tool, its a major help! i am a novice to R but i have been able to navigate a bit, but i am having trouble figuring out the stacking, or how to set it up. E.g. stacking Qb and WR and then doing a bring back. How would i go about achieving this. I saw that there is a an operator (not sure if this is right term) for mlb but cant find the one for NFL.

I have a question on showdown too, but i figured i would start with the stacking.

Thank you again, your efforts are truly appreciated.