I really thought I had a blog post already about Report Templates, guess not 🙂
Well basically you need to create two reports, one for Portrait orientation and one for Landscape orientation.
Next is to copy/paste them into this folder:
C:\Program Files (x86)\Microsoft Visual Studio 9.0\Common7\IDE\PrivateAssemblies\ProjectItems\ReportProject
Once you add a New Report to your Reporting Project, you’ll notice that your Report Templates will be listed: