View gist:d832cdc7fdb3d74c26e5df57303cc03c
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$sitedesign = Get-SPOSiteDesign | where {$_.Title -eq "Advanced Design"} | |
[System.Collections.ArrayList]$existingsitescripts = $sitedesign.SiteScriptIds | select -ExpandProperty Guid | |
$existingsitescripts.Add($sitescript.Id) | |
Set-SPOSiteDesign -Identity $sitedesign.Id -SiteScripts $existingsitescripts |