Integrating Gaant View Items and Calendar View

I'm having an issue finding a solution for meshing Gaant charts on individual sheets and multi-sheet calendars.

On individual sheets we have "Phase" dates, these are anywhere from a few days to a few months. These are great for the Gaant view.

The group calendar shows all the items from the individual sheets, including these "Phase" ranges. Is there any way to filter out these large Phase ranges from the group calendar? I would like to have the group calendar only show the action items.

The only solution I have found so far is to add in an additional check-box column I labeled "Non-Action Items", and then on the calendar filter out the items that have been checked. This will be a lot of work to edit all the previous sheets, so I was wondering if anyone had any other ideas/suggestions?

Thanks much!