You can use ITA to force multi-stop itineraries for a particular flight you're looking at. When doing your search, click the Advanced Routing Codes link when doing your search, and type "DL" for each segment on the outbound and return that you want. For example...

Departing From:
CMH:: DL DL DL

Destination:
TUL:: DL DL DL

...would try to force a search with 3 flights (i.e. 2 stops) in each direction, although there may not be any possible routing options. You can click the ? icon next to the Advanced Routing Code box to see some basic examples and explanations, but this should get you going in the right direction.