PowerShell script to create bulk sub sites in modern site and associate group to that site

In this article, let us see how to create bulk sites by accessing csv in modern site and associate default group to that site.

 Clear-host  Write-Output -msg "Start : Module loading Process" $modulePath = "C:\Program Files (x86)\SharePointPnPPowerShellOnline\Modules\SharePointPnPPowerShellOnline" import-module ($modulePath + "\SharePointPnPPowerShellOnline.psd1") Add-Type -Path ($modulePath + "\SharePointPnP.PowerShell.Online.Commands.dll") Add-Type -Path ($modulePath + "\Microsoft.SharePoint.Client.dll") Add-Type -Path ($modulePath + "\Microsoft.SharePoint.Client.Runtime.dll") Add-Type -Path ($modulePath + "\Microsoft.Online.SharePoint.Client.Tenant.dll") Write-Output -msg "End : Module loading Process"  $cred = Get-Credential $csv = import-csv -Path "D:\Scripts\SiteInput.csv" Clear-Content "D:\SiteCreationLog.txt" try { foreach($value in $csv) { $ParentURL=$value.ParentSiteURL $TargetURL=$value.URL $WebTemplate=$value.Template $Title=$value.Title $Description=$value.Description $URL= $TargetURL -replace $ParentURL+'/'  if($WebTemplate -eq "Team") {       #Connect to Site Collection            Connect-PnPOnline -Url $ParentURL -Credentials $cred     #Create sub web with unique permissions     New-PnPWeb -Title $Title -Url $URL -Description $Description -BreakInheritance -InheritNavigation -Template "STS#3"     Disconnect-PnPOnline     Connect-PnPOnline -Url $TargetURL -Credentials $cred     $owner = (Get-PnPContext).Credentials.UserName      #Create default groups for the new web     $OwnerGroupName=$URL+" Owners"     $MemberGroupName=$URL+" Members"     $VisitorGroupName=$URL+" Visitors"      $ownerGroup = New-PnPGroup -Title $OwnerGroupName -Owner $owner      Set-PnPGroup -Identity $ownerGroup -SetAssociatedGroup Owners     Set-PnPGroupPermissions -Identity $ownerGroup -AddRole "Full Control"            $memberGroup = New-PnPGroup -Title $MemberGroupName -Owner $owner     Set-PnPGroup -Identity $memberGroup -SetAssociatedGroup Members     Set-PnPGroupPermissions -Identity $memberGroup -AddRole "Edit"      $visitorGroup = New-PnPGroup -Title $VisitorGroupName -Owner $owner     Set-PnPGroup -Identity $visitorGroup –SetAssociatedGroup Visitors
     Set-PnPGroupPermissions -Identity $visitorGroup -AddRole "Read"          $TargetURL+" PASS" | Out-File -FilePath D:\SiteCreationLog.txt -Append } else {     Write-Error "Invalid Template Name"      $TargetURL+" Invalid Template Name"| Out-File -FilePath D:\SiteCreationLog.txt -Append } } } catch { Write-Output $_.Exception.Message  $TargetURL+" "+$_.Exception.Message | Out-File -FilePath D:\SiteCreationLog.txt -Append } 

Hope this helps!