Hi Deesloop, I think the way I would do this is to create the ENG SSID and assign no tags to this (and have it broadcast from AP's at all sites), when you then create all the others that are site specific you can tag these, and assign the AP's at each site to only broadcast the relevant "tagged" SSID's. That way when you make any changes to the ENG SSID it will cascade to all sites. To do this, navigate to the individual access points, and on the left panel, create a relevantly named tag e.g sitexx. When you create your SSID's, then navigate to SSID availability and leave the ENG SSID as enabled on all AP's. Then create your site specific SSID's, and under SSID availability select "enabled on some AP's" and add the specific previously named tags for the sites. Hope that makes sense.
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