Limitations of the Add-in
Only one Deployment Framework project within a single solution
The Visual Studio add-in can only recognize a single Deployment Framework for BizTalk project within the BizTalk solution. The Deployment Framework itself does not impose any restrictions on how many deployment projects you create or their locations relative to the solution. However, the add-in will only look for a .btdfproj file in several predefined locations under the solution root directory:
Deployment Framework project does not appear in Solution Explorer like BizTalk and C# projects
Ideally, Deployment Framework for BizTalk projects would appear in Solution Explorer and act like other project types, with property pages, project references, etc. Unfortunately, it is extremely difficult to create a full-blown custom project type for Visual Studio. It would probably take hundreds of hours to create a custom project type, which would consume virtually all project resources for a long time.
The best answer today is to use the Add/Solution Folder option to create a virtual solution folder in your BizTalk solution named "Deployment" (or whatever you named your project folder), then add all of the files in the deployment project folder to the solution folder.
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