combining multiple subforums into one separate forum that lists all combined threads?
 

so I have many subforums at my website for selling auto parts section. For example this is how its setup

audi
-complete vehicles
-parts
-wanted
bmw
-complete vehicles
-parts
-wanted
chevrolet
-complete vehicles
-parts
-wanted

I would like to combine all the content in the "complete vehicles" forums into one separate forum so people could browse all the complete vehicles for sale in one forum. So that way all the listings for complete vehicles would be listed in one thread.

thanks