You used to be able to specify the booking code in matrix search criteria (of course the bucket needs to be for sale at the moment) using "/f bc=A|bc=B" etc. (if you're unfamiliar with /f switches just note that they are not per-segment and must be listed after all per-segment switches). However, lately the /f switches have only been applying to the first segment for me (rather than all segments as the did in the old versions of matrix).