By default, MS Project treats inserted projects as summary tasks, so, MS project calculates a single critical path across all projects by using the latest finish date of the project. Due to this nature, a subproject within master appears like they don’t have critical paths of their own.
To see the critical path for each subproject, you have to specify the following settings:
- On master project, Tools menu -> Options -> Calculation tab -> uncheck the option “Inserted projects are calculated like summary tasks”
With above setting, MS project calculated for the mater project independent of subprojects, and also calculates the critical path for each subproject.
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