How to add one more OU on $DomainName

Hello world!!!
How to add one more OU on $DomainName? I would like to add ‘LDAP://OU=TST,DC=fenix,DC=com’ and keep ‘LDAP://CN=Computers,DC=fenix,DC=com’.

$DomainName = ‘LDAP://CN=Computers,DC=fenix,DC=com’
$Root = New-Object DirectoryServices.DirectoryEntry $DomainName
$objSearcher = New-Object DirectoryServices.DirectorySearcher
$objSearcher.SearchRoot = $Root
$objSearcher.SearchScope = “SubTree”

$ADResults = @()

$colResults = $objSearcher.FindAll()
foreach ($objResult in $colResults)

I’m not sure if I got you right but you can create a new organizational unit simply with the cmdlet of the module ActiveDirectory

A computer can’t live in more than one OU.