Hey
you may find this article about resteals in HU sngs useful:
http://www.pokericmcalculator.com/en...up-sit-and-go/
But to answer your question here: when we analyze 3bet or 4bet spot, opponent makes a raise with a certain range. Then, if we shove, he will call with a part of that range .
So there are 2 ranges, for those spots Entire range that he raised with is marked as RA range, part of range that he calls resteal with is called CA range.
You edit those 2 separately, if CA is equal to RA range, then it means that he calls with entire range. If he calls with 20% and 3bets with 80% it means that he will fold to 3 bet 75% of the time (80-20)/(80)
I hope it is clear, I am not allowed to post screenshots in this thread so for more info please check article.
If anything is still unclear don't hesitate to ask.