How can we do intersection between picklist and recordtype inside apex?

HI Mohit,

You have to add the values dynamically from the picklist and recordtype and can be stored in two separate list and can be merged together when the list have all the values.

To get values from picklist dynamically follow the link:

https://developer.salesforce.com/blogs/developer-relations/2008/12/using-the-metadata-api-to-retrieve-picklist-values.html