How to sell extra custom features for WPMUDEV plugins?

I would like to know how do we sell custom features we made for WPMUDEV plugins? I had worked on many plugins and made custom features like WPML enabled signup for old membership and DRIP content module wise, page wise and unit wise for Course Press PRO. Is there any facility by wpmudev allowing us to sell this to members here..( as I see few features are requested by a lot of people).