Forum for users that want to write their own custom queries against the PT database either via the Structured Query Language (SQL) or using the PT3 custom stats/reports interface.
Then what's going to be easier is to use stats that already exist and filter to the situation you want to see. See the Tutorial: Filters for more on how to use the filters. You'd want to add a fitler for 3betting preflop and cbetting the flop and then analyze from there.