Hi,
The customization's will not carry over to Production.
You will need to migrate the configuration and customization's manually.
The steps you will need to take are -
1. Set-up / Enable the Portal in Production.
Microsoft will add the Portal managed solutions in your Prod environment.
2. Export and import the Portal configuration data from sandbox to Production
This is all the Portal data configured like web roles, entity permissions, entity list and forms etc.
You can use the Microsoft ConfigurationMigration tool available in SDK.
3. Export your customizations in a solution from sandbox CRM instance to Prod instance. Publish the solution.
4. Now you should be able to see the Portal with all your configuration and customization's in Production.
