$depts="Sales","marketing","engineering","Exectutives"
$departments=Get-ADOrganizationalUnit -filter *|where {$_.name -like "departments"}
$conatiners="users","computers"
foreach($dept in $depts){New-ADOrganizationalUnit -Name $Dept -Path ($departments.DistinguishedName)
        $newtarget=Get-ADOrganizationalUnit -Filter *|where {$_.name -like $dept}
                foreach($conatiner in $conatiner){New-ADOrganizationalUnit -Name $conatiner -Path ($newtarget.distinguishedname)}
             }