Hello Varma,
- To create isolated instance of app service, you can set the pricing tier of your app service plan to "Isolated" or "IsolatedV2". Both these tiers run dedicated Azure VMs on dedicated Azure VNets and provides network isolation on top of compute isolation to your apps.
- Azure app service is an HTTP-based service for hosting web applications and for you to run a webapp, this needs to run within an App Service Plan
- I'm guessing you're asking about the ability to host multiple webapps within the same app service plan. If so, you can create new webapps and at the time of creation, make sure to point them to the same instance of the app service plan. However, please be mindful of the fact that when you do so, all the webapps share the same underlying app service plan and hence, depending on your webapp and the app service plan, there might be resource crunch
- You create an app service plan and set the pricing plan to the "Isolated" mode and choose the specific configuration.
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