MacProject II can determine the duration for all the subprojects in a project family, based on the dates and durations of tasks within each subproject.
MacProject II then reads that duration into a master project, when you so direct, and recalculates the whole project family as if it were one large project.
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Working with Subprojects
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Subproject Dates & Durations
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You can display dates from the master project for the start and end of a subproject, and you can set dates for any tasks.