How to use AD cmdlets for Powershell to update Subnet location and/or description field in existingActive directory sites and subnets, using a csv.

Hello. Been searching other posts, forums, etc. and thought I would come here.  I used the addsubnet.ps1 script from Jerry Martin to batch create thousands of subnets in AD using csv files for input. It works like a champ.  However, we now have found that several hundred subnets already existed and none have a location field populated.  We need the location field to be populated for use with printers etc.

I saw the script on updating AD users info at - http://blogs.technet.com/b/heyscriptingguy/archive/2010/10/14/use-powershell-and-active-directory-cmdlets-to-update-users-in-active-directory.aspx

 and thought that maybe that logic could be modified to update an existing subnet's location field?

Here is a code snip from the addsubnet.ps1 that creates a non-existing subnet...

        #Test if the new subnet doesn't already exist
        If (!(Test-XADObject -Identity $newSubnetDN)) 
            {
 
            #Creating the new subnet
            $for = [System.DirectoryServices.ActiveDirectory.Forest]::GetCurrentForest()
            $fortyp = [System.DirectoryServices.ActiveDirectory.DirectoryContexttype]"forest"
            $forcntxt = new-object System.DirectoryServices.ActiveDirectory.DirectoryContext($fortyp, $for)
            
            $subnet = new-object System.DirectoryServices.ActiveDirectory.ActiveDirectorySubnet($forcntxt, $SB.subnetname, $SB.sitename)
            $Subnet.Location = $SB.subnetlocation
            $subnet.Save()
            
            #Set the Subnet Description
            $subnetde = $subnet.GetDirectoryEntry()
            $subnetde.Description = $SB.subnetdescription
            $subnetde.CommitChanges()

Can anyone provide some direction on how to update the subnet.location field using a list of subnets in a csv or other method?

Thanks

Don K

Don K