Remove disabled accounts managers

Create a list of users:

Get-ADUser -filter * -SearchBase "OU=Disabled Users,OU=bein, DC=mydomain, DC=net" -properties Manager|?{$_.manager -notlike $NULL}|select Name,samaccountname,DistinguishedName|export-csv c:\temp\disUsers.csv



After verification, execute below to remove managers.

Import-csv c:\temp\disUsers.csv|foreach-object{set-aduser -id $_.samaccountname -manager $NULL -whatif}