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# Set path to the CSV file
$csvPath = "C:\temp\user.csv"

# Import the CSV file
$users = Import-Csv -Path $csvPath

# Group users by 'Functie'
$groupedUsers = $users | Group-Object -Property Functie

# Iterate over each group
foreach ($group in $groupedUsers) {
    # Calculate 10% of users for the current function
    $totalUsers = $group.Count
    $percent10 = [math]::Ceiling($totalUsers * 0.1)

    # Select random 10% of users from the current function
    $selectedUsers = $group.Group | Get-Random -Count $percent10

    # Update 'Retea_test' column for the selected users
    foreach ($user in $selectedUsers) {
        $user.Retea_test = "ok"
    }
}

# Export the updated users back to CSV
$users | Export-Csv -Path $csvPath -NoTypeInformation