In Visual Studio the "Add Solution to CA Harvest SCM" is disabled (greyed out).
If you select File->CA SCM, the "Add Solution to CA Harvest SCM" in the popup menu will sometimes be disabled or greyed out.
The "Add Solution to CA Harvest SCM" process is a solution level process. To enable this process, you must first select (highlight) the solution in the Visual Studio solution explorer tree view pane, then right-click on the solution and the process will now be available and enabled in the popup menu.
Selecting File->CA SCM will display "Add Solution to CA Harvest SCM" is disabled:
Solution is to select the solution in the solution explorer, R-click on the solution and the process "Add Solution to CA SCM" will be available and enabled: