CustomType.ps1

$Cache:groupNames = Get-ADOrganizationalUnit -LDAPFilter '(name=*)' -SearchBase 'OU=OU1,OU=Groups,DC=domain,DC=domain,DC=local' -SearchScope OneLevel | Select-Object -ExpandProperty name 
Add-Type -TypeDefinition @"
   // very simple enum type
   public enum Departments
   {
      `n $(foreach ($Group in ($Cache:groupNames)){"`t$($Group.replace(" ","_"))`,"}
      ) `n
   }
"@
 
New-UDCard -Title "Select Dept From Drop Down." -Content {
    New-UDInput -Title "Departments" -Endpoint{                           
        param ([Departments]$Department)
                                
        New-UDInputAction -Toast "You selected: $Department"

        }
    }