Accommodating car dealers with the Auction Theme

I am currently using the Auction Theme, to allow people to sell their motor vehicles, using either the auction listing, or a regular classified ad listing.

I would also like to get dealers onboard, because initially I think they will play a key role in helping me build much needed inventory on the site.

Ive looked in the back end and I do see the CSV bulk upload option, which *may* do in part what I need, however I would like be accommodate dealers properly with dedicated logins and profile pages.

I’d like to speak with someone, or at least have one of the support team point me in the right direction in terms of perhaps “adding” the dealership option to the auction theme.

I guess my questions are –

Is this possible?
Could you assist with this?
Who do I need to speak to in terms of having this done?

My site (test environment) https://www.romaines.com.au/listing/sale-2007-bmw-m3-e92-manual/

Thank you.