Can I merge intraday bars in AB?

["netbull2000" <netbull2000@xxxx>]

I intend to test some long-term ES trading system for 30 min bars, 
but I have data for 15 min bars. Can AB merge these bars into 30 min 
bars. I know that Sierra Chart does that very well. I use SC for 
trading with IB data feed, but for backtesting it is much more 
limited than AB.

I would appreciate your advice in this matter. I own AB, but have 
never tried it out on any larger project and have not used it for 
many months so my experience is limited.

TIA,
Wally