Create Multiple SPGroups in all the subsites if the SPGroups doesn't exist

Try below:

http://ift.tt/1qC0Aki

function New-SPGroup {
<#
.Synopsis
        Use New-SPGroup to create a SharePoint Group.
.Description
        This function uses the Add() method of a SharePoint RoleAssignments property in an SPWeb to create a SharePoint Group.
.Example
        C:\PS>New-SPGroup -Web http://intranet -GroupName "Test Group" -OwnerName DOMAIN\User -MemberName DOMAIN\User2 -Description "My Group"
        This example creates a group called "Test Group" in the http://intranet site, with a description of "My Group".  The owner is DOMAIN\User and the first member of the group is DOMAIN\User2.
.Notes
        Name: New-SPGroup
        Author: Ryan Dennis
        Last Edit: July 18th 2011
        Keywords: New-SPGroup
.Link

http://ift.tt/1qQKgyf


http://ift.tt/1qC0Boi

.Inputs
        None
.Outputs
        None
#Requires -Version 2.0
#>
        [CmdletBinding()]
        Param(
        [Microsoft.SharePoint.PowerShell.SPWebPipeBind]$Web,
        [string]$GroupName,
        [string]$OwnerName,
        [string]$MemberName,
        [string]$Description
        )
        $SPWeb = $Web.Read()
        if ($SPWeb.SiteGroups[$GroupName] -ne $null){
                throw "Group $GroupName already exists!"      
        }
        if ($SPWeb.Site.WebApplication.UseClaimsAuthentication){
                $op = New-SPClaimsPrincipal $OwnerName -IdentityType WindowsSamAccountName
                $mp = New-SPClaimsPrincipal $MemberName -IdentityType WindowsSamAccountName
                $owner = $SPWeb | Get-SPUser $op
                $member = $SPWeb | Get-SPUser $mp
        }
        else {
        $owner = $SPWeb | Get-SPUser $OwnerName
        $member = $SPWeb | Get-SPUser $MemberName
        }
$SPWeb.SiteGroups.Add($GroupName, $owner, $member, $Description)
$SPGroup = $SPWeb.SiteGroups[$GroupName]
$SPWeb.RoleAssignments.Add($SPGroup)
$SPWeb.Dispose()
return $SPGroup
}

Also check
http://ift.tt/1qQKgyj
http://ift.tt/1qQKdmc

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