PokerTracker

Please move to PT4 Custom Stats, Reports and SQL forum.

How do we create a column to filter out when we for example raise EP and get 3Bet from the BU?

You don't need a specific stat for the position of the player who you're seeing the stat for - you can do that using the Position property in the Hud.
It is possible to specify the position of the opponent action, but I'm not sure which way round you want this stat? We have built-in stats for 3betting vs 2bets from certain positions - search for "vs" in Configure > Statistics to see how those are made.
If you can see how to do what you want, please explain exactly what situation you'd like to count and we'll help you out.

Custom Stats Guide

I'd like to create a stat that shows how often EP 4Bet vs a 3Bet from BB.
And after knowing how, I'd like to do all of them: EP 4Bet vs CO, EP 4Bet vs BU... HJ 4Bet vs SB, HJ 4Bet vs BB etc.

To specify the position of the 3bettor use this type of expression:

char_length(cash_hand_summary.str_aggressors_p) >= 3 AND substring(cash_hand_summary.str_aggressors_p from 3 for 1)::int = 8

The 8 here is position 8 - the BB. Replace that with the position that you want to test.
Include that in a column based on the column for making a 4bet.

You don't need to specify "EP" because you can do that using the Hud property.