If you put a package template in the following folder:
%ProgramFiles%\Microsoft Visual Studio 8\Common7\IDE\PrivateAssemblies\ProjectItems\DataTransformationProject\DataTransformationItems
It will be available in Add > New Item:
Just make sure that you (re)generate new ID for each package created this way.
New Package ID
After a package is created using a package template, you should change its ID. If you forget to do that, SSIS logging will use same id for both original and the copy and you will not be able to differentiate in the log between results of these two packages.
- Open the package in VS. Make sure that you are in Control Flow.
- Click on ID property and choose Get New ID from the menu.