How to use substring on a property within a "select -expand properties" statement

Apologies if this is a dumb question - I'm just familiarizing myself with Powershell.
I have an existing script which queries groups in AD. It outputs some attributes of the groups to a CSV file.
I'm trying to modify it a little bit - one of the attributes it returns is the distinguishedname of each group. I'm trying to get it to chop off the first part ("CN=groupname,"), leaving the OU path of each group.
Here is the original line that I think needs to be modified:
$AllGroups = $GroupAccounts | select -Expand Properties | select @{n='GroupName';e={$_.name}}, @{n='Description';e={$_.description}}, @{n='DN';e={$_.distinguishedname}}
Based on what I've gleaned so far about Powershell, I figured I would use the substring function, along with the length of the group's name (plus 4 to account for the "CN=" and the first comma). But every variation that I've tried returns nothing
at all for the last property ("DN").
Any suggestions?

Hi,
Here's an example:
Get-ADUser testac1 |
Select @{N='DN';E={$_.DistinguishedName.Substring($_.DistinguishedName.IndexOf(',')+1)}}
Output:
DN
OU=Test 1,DC=domain,DC=local
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