How to add table in Entity Framework?

Question

I have a project that I made in Asp.net with Entity Framework.

Now I want to add one or more tables in the database and one or more stored procedures. But entities n

Answer 1

Sharique's answer is the good one. But I noticed a thing: when the Mapping Details window is active(near Error List, Output) and if you are trying to add a new Entity (right click the design surface, Add -> Entity), the popup dialog, "Add Entity" it won't show.