You can use a Database Project in Visual Studio. With Database Projects, you can generate SQL Scripts for any existing database, you can create difference (update) scripts, you can add SQL scripts of your own, etc.
Database Projects are extremely handy in many scenarios. Check out this link on MSDN: http://msdn.microsoft.com/en-us/library/xee70aty.aspx
There is also guidance on CodeProject about this: http://www.codeproject.com/Articles/245612/Creating-a-Database-Project-with-Visual-Studio
You'll love it!