I am currently trying to add a new search to our omnitracker. We are using categories to create a relationship between different entries and I can easily use the categories to list all the entries that have been tagged accordingly. But I want to add the ability of using more than one category per entry, i.e. per ticket, so that I can list one entry in two or more categories.

I have already implemented the selection of "category" - "category3" in the forms and the fields are in the folder definition. Permissions are fine too.
Problem is that I cannot create a search that is able to control more than one category. Can I merge those entries (same mark-up) and search the result?