Listings with different post types and frontend submission

Hi there,

I am just creating a website where you can easily find your WP-Product (freemium and premium) using Directory plugin. By the way, if you are aware of a similar site which is already out there please let me know.

So I now have two different post types "Listing-Themes" and "Listing-Plugins" and the problem is that in the submission form from the frontend I can only add the listing from the original post type but not from the new post type.

Where can I find the layout for the frontend submission form "Add new listing"?

What would be the best way to add listings for plugins (the second post type)? Create a second fronted submission form for Plugins or add a custom field to the existing form where user can select the type of listings and the form gets reloaded depending on a type of listings?

Thank you very much for your answer.

Kind regards,
Daniel