Assign a Calendar to a Project
You can assign a calendar or a rolling wave calendar to a project by using the New Project wizard when creating a new project, or by using the Files tab of the Project Properties dialog box.
Use Calendars in a Multi-project Environment
In a multi-project environment, you can share the same calendar with all of the subprojects and advance at the master project level, or you can have each subproject use a different calendar.
If you intend to produce the IPMR Format 3 report, the master project and all subprojects must share a calendar. When you advance the calendar, you must also select the master project for which you intend to produce the IPMR Format 3 report. This will save the beginning period at the master project so you can report at that level and advances the calendar for each of the subprojects.