[Plugin: User Access Manager] Restrict post creation to a particular category

I have certain roles created by S2Member and want these roles to be able to create post (like contributors) but want to restrict them to post a in particular category only. Like the role “Buyer” should be able to create post in the category “Buy car” and users with role “sellers” should be able to create post in “Sell car” category only.

How can this be done.

https://www.ads-software.com/extend/plugins/user-access-manager/