https://learn.microsoft.com/en-us/powershell/module/az.websites/new-azwebapp?view=azps-15.6.0&viewFallbackFrom=azps-15.4.0
New-AzWebApp (Az.Websites) | Microsoft Learn
The New-AzWebApp cmdlet creates an Azure Web App in a given a resource group that uses the specified App Service plan and data center.
newazwebsitesmicrosoftlearn