Hello! Could IMDB please include a NEW CATEGORY : Film Studio BACKLOT Design?

Hi, Carol Wood.

If you mean the movies created with the help of such studios, they can be tagged and found under the keyword "studio-backlot":
https://www.imdb.com/search/keyword?keywords=studio-backlot

If you mean the studios which job is the backlot design, such as this one:
https://universalstudioslot.com/backlot
they may be added as miscellaneous companies to any related title:

• 

and the "category" (job) will be created if it is not in the base; but you need to enter the new one:

• 

If you mean to make such companies searchable as "backlot" (not just "miscellaneous") depending on the job and not the name, I'm afraid this variant will not be implemented soon. At least, I see no search for "sound facilities", "stunts agency", and so on.

Or please explain further, what do you mean under the "category"?

PS: Sorry, the Universal Studios "Lot" is not the best example, since it goes for production companies.