Add multiple post types to a post

Hi guys

When using the post type in a post is only possible to choose one post type from the list. I was wondering if there is a way to do so the user of the site are able to choose multiple types of post types. In this way the user of the site would be able to choose what versions of Minecraft the creation would work in.

http://www.minecraftmaps.dk/l/index.php/discussions

RR