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:
With above setting, MS project calculated for the mater project independent of subprojects, and also calculates the critical path for each subproject.
- On master project, Tools menu -> Options -> Calculation tab -> uncheck the option “Inserted projects are calculated like summary tasks”