Adding Multiple AD Users to Multiple Groups via CSV using PowerShell Columns are Group names not headers Users under group names

You would need to loop through the column headers. You can obtain a list of these properties by using the Get-Member cmdlet.

$usersToAdd = Import-CSV users.csv
$groups = ($usersToAdd | Get-Member | Where-Object { $_.MemberType -eq "NoteProperty" }).Name

From here you could loop through the groups querying the members that fall under each group in the original csv.

foreach ($group in $groups) {
    $users = $usersToAdd.$group
    foreach ($user in $users) {
        Add-ADGroupMember -Identity $group -Members $user -Confirm:$false
    }
}

You may get some empty values if some columns have more users than others do, so perhaps you will want to check for that too.

foreach ($group in $groups) {
    $users = $usersToAdd.$group
    foreach ($user in $users) {
        if (![string]::IsNullOrEmpty($user)) {
            Add-ADGroupMember -Identity $group -Members $user -Confirm:$false
        }
    }
}

Thank you for your response Ash! I will try this shortly to confirm. I found this script online that worked rather well Though I am still breaking this down to fully understand it. Thank you again for your help!!::

> $rows = Import-Csv "C:\FILE.csv" 
> $groups = @{} 
> foreach ($header in $rows[0].PSObject.Properties.Name) { $groups[$header] = @() } 
> foreach ($row in $rows) 
> {
>     [string[]]$keys = $groups.Keys
>     foreach ($key in $keys)
>     {
>         if ($row.$key) { $groups[$key] += $row.$key }
>     }
> } 
>foreach ($key in $groups.Keys) { Add-ADGroupMember -Identity $key -Members $groups[$key] -Verbose }