People In My Server Cant Spawn Items

When i created a server and join it, i cant spawn items that have a Shield icon, such as nukes. Yet if i create a match within garrys mod then i can use these items. People who join cannot spawn these items. How can i fix this? I couldnt find any solution on google. Also how do i save duplicated props. I click the + sign with a name added but doesnt save.

Thanks in advance.