Change a Modern SharePoint subsite to its own site

NicolasKheirallah
Here's my version of applying a template to a new site.
Hope it's not too buggy. Works for me.
You will need to supply your own JSON and XML file.

Thanks for all your input on this project.

# Managing creation of department SharePoint sites using a standard template
# This script has 4 functions
#============================================================
# Menu Function
#============================================================
Function ShowMenu
{
param([string]$title = 'MenuName')

Clear-Host

Write-Host `n"================ $title =================="`n -ForegroundColor White -BackgroundColor DarkGreen
Write-Host " Enter 1 to: Create New SharePoint Site" -ForegroundColor White -BackgroundColor DarkGreen
Write-Host " Enter 2 to: Create New XML Template File" -ForegroundColor White -BackgroundColor DarkGreen
Write-Host " Enter 3 to: Apply MIU Template to Site" -ForegroundColor White -BackgroundColor DarkGreen
Write-Host " Enter E to: Exit Script"`n -ForegroundColor White -BackgroundColor DarkGreen
}
#=========================================================================================
# Create SharePoint Team Site
#
# This function will create a basic Team site in SPO. The site will have General folders in the Document
# repository, an Attention Issues List, and some Quick links to Knowledge Base.
# You will need to manually update the Site Theme and Header Info.
#=========================================================================================
Function Create_SPO
{
clear-host

$Name = "" # Site name WITH spaces
$Sn = "" # Site name WITHOUT spaces to append to SPO URL
$Own = "" # Owner's Username - ****@miu.edu
$T = "STS#3" # Template Type - use Get-SPOWebTemplate to get a list of valid templates
$SQ = 1024 # Storage Quota - in Megabytes. Can't exceed 25tb (our tenent max quota)
$TZ = 11 # SP Time Zone Collection - https://learn.microsoft.com/en-us/dotnet/api/microsoft.sharepoint.spregionalsettings.timezones?view=sharepoint-server

Write-Host `n" Create a SharePoint Site "`n -ForegroundColor White -BackgroundColor DarkGreen
do
{
$v = $false
$Name = (Read-Host -Prompt "Please enter a name for your New Site or type E to Exit")
$Sn = $Name -replace '\s', ''

If($Sn -eq '')
{
write-host `n'Name Not Entered.' -ForegroundColor White -BackgroundColor DarkGreen
}
else
{
If($Sn.ToUpper() -eq 'E')
{
$v = $true
}
else
{
# we have a name we need to test to see if name is currently being used
$Url = $Url + $Sn
try{
Get-SPOSite -identity $Url -ErrorAction Stop
#if we DO NOT error out that means there is a SP site with this name already
write-host `n"This name is being used. Please enter a different name."
}
catch{
# Get-SPOSite Errored out - No Site with that name found
$v = $true
}
}
}
}until($v = $true)

if($Sn.ToUpper() -ne 'E')
{
do
{
$v = $false
$Own = (Read-Host `n"Please enter the MIU Username of the Owner or E to Exit")

If($Own.ToUpper() -eq 'E')
{
$v = $true
}
else
{
try
{
Get-MsolUser -UserPrincipalName $Own -ErrorAction Stop
$v = $true
}
catch
{
write-host `n"Username not Found. Re-enter Username"`n -ForegroundColor White -BackgroundColor DarkGreen
}
}
}until($v -eq $true)

# at this point we should either have a (valid site name and valid username) or an E
# only a valid site name and username will trigger the New-SPOSite cmdlet

If($Own.ToUpper() -ne 'E')
{
New-SPOSite -Url $Url -Template $T -Owner $Own -StorageQuota $sq -Title $Name -TimeZoneId $tz -NoWait
}
}
}

#=========================================================================================
# Create New XML File
#
# If you make changes to your SPO Template, you must run this function to update your existing XML file.
# If you do not, the changes you made to the Template will not be applied.
#=========================================================================================
Function Create_XML
{
$c = ""

Write-Host `n "**** Create/Update XML file from SPO Template ****"`n -ForegroundColor white -BackgroundColor darkgreen

$c = (Read-Host -Prompt "Create Xml File? (Y/N)").ToUpper()

if ($c -eq "Y")
{
Connect-PnpOnline -Credential $Cr -Url $Tsite

Get-PnPSiteTemplate -Configuration $jsonPath -Out $xmlPath

Write-Host `n"*** XML created and saved in " + $xmlPath +" ***"`n -ForegroundColor white -BackgroundColor darkgreen
}
}

#=========================================================================================
# Apply Template to New Site
#
# This Function requests the name of any SPO site where you want to apply the Template attributes.
#=========================================================================================
Function Apply_Template
{
$NewSite = ""
$c = ""

Write-Host `n "**** Apply Template Attributes to SP Site ****"`n -ForegroundColor white -BackgroundColor darkgreen

$c = (Read-Host -Prompt "Apply XML Template to a site?(Y/N)")

If($c.ToUpper() -eq "Y")
{
do
{
$Newsite = (Read-Host -Prompt "Please enter a name of the Site to apply the template or E to Exit")
$Newsite = $Newsite -replace '\s', ''

If($NewSite -eq '')
{
write-host `n'Please enter a Site Name or E to exit' -ForegroundColor White -BackgroundColor DarkGreen
}
}until($NewSite -ne '')

if($NewSite -ne 'E')
{
$newSite = $Url + $NewSite

Connect-PnpOnline -Credential $Cr -Url $Newsite
Invoke-PnPSiteTemplate -Path $xmlPath

Write-Host `n"*** Tempate Applied - Please update Site Thumbnail, Logo, and Theme ***"`n -ForegroundColor white -BackgroundColor darkgreen
}
}
}

#=========================================================================================
# Script to call above functions
#=========================================================================================
Clear-Host
# replace ***** with your credential file name
$Cr = Import-Clixml -Path "${env:\userprofile}\*****.xml"

[string]$Url = "https://<Your SP site>.sharepoint.com/sites/"
[string]$Tsite = "https://<Your SP site>.sharepoint.com/sites/Your SiteTemplate Name"
[string]$jsonPath = "C:\Users\SharePoint\Site Templates\SPTemplate.json"
[string]$xmlPath = "C:\Users\SharePoint\Site Templates\PnPOutFile.xml"

write-host "To create a new SPO site, You MUST sign into MSOL and SPO services with your Credentials"`n -ForegroundColor White -BackgroundColor DarkGreen

$ask = (Read-host "Connect to MS Modules with Credentials? (Y/N)")

if($ask.ToUpper() -eq 'Y')
{
Connect-MsolService -Credential $Cr
Connect-SPOService -Credential $Cr -Url "https://<Your Admin SP site>.sharepoint.com/"
}

do
{
$inp = ""
ShowMenu -title "SharePoint Online Template App"
$inp = (Read-host "Please make a selection")

switch ($inp)
{
'1' {Create_SPO}
'2' {Create_XML}
'3' {Apply_Template}
}
}until($inp.ToUpper() -eq 'E')

write-host `n"***** Exiting Script *****"`n -ForegroundColor White -BackgroundColor DarkGreen

Thanks, Nicolas!

Great job!!

You should create a blogpost about this and other problems you faces, great way to keep track of it and if other people face the same problems.

You can also upload your script here if you want 🙂

https://pnp.github.io/script-samples/