App Service plans give you the flexibility to allocate specific apps to a given set of resources and further optimize your Azure resource utilization.

The purpose of creating an Azure Service Plan is to save the cost of your resources. With one Azure App Service Plan, you can share across multiple apps. 

Implementation:

Step 1: Log in to Azure Portal.

Step 2: Search for App Service Plan from Azure Global Search Engine.

Step 3: Access the App Service plan and Click on Create.

Step 4: Under Product Details Select your active Azure Subscription and Resource group in which you want to create.

Step 5: Under App Service Plan details, enter a unique app service name, select your operating system either Linux or windows, and app service plan deployment region.

Step 6: Choose the App Service plan pricing tier and Click on Apply.

Note: App Service plan pricing tier determines the location, features, cost and compute resources associated with your app.

For Dev/Test:

For Production Work Loads:

Step 7: Verify all the details and Click on Review + create to create an app service plan.

Once the deployment is done. You can use this app service plan across multiple apps.