Merging category results
I am building a database with many top level categories. The sub categories of afew of these top level categories will be named the same and will contain the same listings. ie. two top level categories will be named ' Sports and recreation' & ’Marine and Boating' Both of these will have a sub category named 'Electronics & gadgets' - Is there a way to merge the results of both of these sub categories so they display the listings together. Ie, someone searching 'Electronics & gadgets' via the ‘Sports and recreation’ category will also see the 'Electronics & gadgets' listings results from via the ‘Marine and Boating’ Category.
I hope this is making sense, any help would be greatly appreciated