Clearing Links to Microsoft Project Files

When you export your schedule to MS Project, APM creates a link between your APM schedule and the MS Project file. You can break this link by clearing the MS Project file. If you break the link before you import the schedule back into APM, the changes you made in MS Project will not be shown in APM. Any additional changes you make to the MS Project file can no longer be imported to the APM schedule.
You can re-create the link by exporting the schedule to MS Project.

To Clear a Link to a Microsoft Project File

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From the Tools menu, select MS Project, and then select Clear. The Clear MS Project File dialog appears, and the Microsoft Project file location is displayed.
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Click OK. The link between your APM schedule and the MS Project file is removed.