You can remove a software collection from the Software Collections list by deleting it. If the software collection is assigned to a licensed product, it (and its installation quantity) is removed from the licensed product.
Deleting a software collection does not delete the discovered products that are members of the collection.
In ZENworks Control Center, click the Asset Management tab.
Click Software Collections.
In the Software Collections panel, select the collections you want to delete.
Click Delete.