Improting Dependencies
When importing from MS Project the importer will also take care of importing Predecessor-Successor dependencies between Tasks. That is performed by creating "depends on" associations between the imported work items. See also:
Exporting Dependencies.
The importer creates a special depends on association for such imported dependencies. That is recognized from its comment as shown below. The comment also contains the Predecessor-dependency type.
View the Types of task links on support.office.com .
The MS Project importer and exporter automatically synchronizes dependencies such a way that:
• The special "MS-Project" import dependency will be removed by the importer if reimporting the same Task/work-item, but that dependency is removed in "MS-Project".
• The special "MS-Project" import dependency is created automatically to preserve this information during imports if necessary.
• If a manual dependency (manual means not created by importer) already exists that is always kept and never removed.