Move-ADGroupMembers.ps1

Param(
    [parameter(Mandatory=$true,
        HelpMessage="Enter AD group to move from.")]
        [string]
        $SourceGroup,
    [parameter(Mandatory=$true,
        HelpMessage="Enter AD group to move to.")]
        [string]
        $TargetGroup
)
Import-Module -Name ActiveDirectory -ErrorAction SilentlyContinue

Get-ADGroupMember -Recursive -Identity $SourceGroup | ForEach-Object {
    $Error.Clear()
    Try
    {
        Write-Debug -Message "Add-ADGroupMember -Members $($_.SamAccountName)-Identity $($TargetGroup)"
        Add-ADGroupMember -Members $($_.SamAccountName) -Identity $($TargetGroup)
    }
    Catch
    {
        Write-Warning -Message "An error occurred when attempting to add $($_.SamAccountName)to $($TargetGroup)"
    }
    If (!$Error)
    {
        Try
        {
            Write-Debug -Message "Remove-ADGroupMember -Members $($_.SamAccountName)-Identity $($SourceGroup)  -Confirm:$false"
            Remove-ADGroupMember -Members $($_.SamAccountName) -Identity $($SourceGroup) -Confirm:$false
        }
        Catch
        {
            Write-Warning -Message "An error occurred when attempting to remove $($_.SamAccountName)from $($SourceGroup)"
        }
    }
}