Reducing server resources whilst still having many

Hello, Im quite new to developing and I am running a server with a few friends. I wanted to ask if anyone could share or knows how to have less resources whilst having many. So could I have 200 custom cars but them be 1 resource? How could I have scripts into less resources? From what I know esx is best to be started as individual resources, is it possible to reduce the overall resource slots used? Thank you in advance!

You should definitely use the search bar on the forum - I found two guides that will answer your questions.
The vehicle merging and the resource one

Thanks Ill take a look!