Hi I have added 4 groups to site collection 'A' using the powershell script below. How can I add the same groups in a site under the site collection 'A'
`$web=Get-SPWeb "http://sitecollectionurl"`
$newGroup=$web.SiteGroups.Add($groupName,$web.Site.Owner,$web.Site.Owner,$description)
$group=$web.SiteGroups[$groupName]
$roleAssignment=New-Object Microsoft.SharePoint.SPRoleAssignment($group)
$roleDefinition=$web.RoleDefinitions[$permissionLevel]
$roleAssignment.RoleDefinitionBindings.Add($roleDefinition)
$web.RoleAssignments.Add($roleAssignment);
$web.Update()
$web.Dispose()