The groups you have created are listed here. Click to view all listings in the group. These groups are not public and are only visible to you

The catalogs you have created are listed here. These catalogs are visible to public. Click to view all listings in the catalog. For example, catalogs are used for project listings where there are multiple types of properties within the same project.

Select the groups you want to add this listing to.

Select the Catalog you want to add this listing to. Listings can be part of only 1 catalog at most.