How to: Add Merge Modules to a Deployment Project
Merge modules (.msm files) allow you to share components between multiple deployment projects. You can create your own merge modules using Visual Studio, or you can use existing merge modules that are available for many standard components from Microsoft as well as from third-party vendors.
The dialog boxes and menu commands you see might differ from those described in Help depending on your active settings or edition. To change your settings, choose Import and Export Settings on the Tools menu. For more information, see Visual Studio Settings.
To add a merge module to a deployment project
Select the deployment project in Solution Explorer.
On the Project menu, point to Add, and then click Merge Module.
In the resulting Add Modules dialog box, browse to the location of the merge module that you want to add.