Hi Carlo,
You cannot delete WLAN services that are being used the controller will not let you.
![c01b1ecfd8ac4c69b3888a627280962a_RackMultipart20161123-22195-1te0fsf-WLAN_service_inline.png c01b1ecfd8ac4c69b3888a627280962a_RackMultipart20161123-22195-1te0fsf-WLAN_service_inline.png](/t5/image/serverpage/image-id/386iA14916D0F0389486/image-size/large?v=v2&px=999)
If there are WLAN services that are no longer required then i would recommend you delete them. If however, they are all currently active, then i would not recommend to delete them. You will not be able to add further WLAN services in your current set up due to system limitations.
Do you know how many more sites you will be growing to?
Hope this helps.
Sam