You can filter for effective stack via 'Hand Details -> Pot Size & Stack Depth' although bear in mind that the effective stack in PokerTracker is the amount a player can potentially lose as of their first action in the hand so in cases where the SB folds with their first action the effective stack for the BB in that case would be zero. To workaround this you can create a
custom report. Next click the 'Filters' link, select 'Add New Expression Filters' and turn off the 'Filter on Active Player' option. This will allow you to filter the hands from the SB's perspective regardless of who is Hero in the hand.