Revit does not recognize breaklines in a topo model. One of the major disadvantages in Topo surface creation in Revit is the missing ability to add breaklines.
Regarding your issue, it seems that Revit does not keep the detail for the edits (Breaklines/Boundary) when you use them in Revit in any manipulation where the Topography will be modified. You can try to link topography over BIM 360 from Civil 3D to keep the edits but note that it will not keep the detail for the edits (Breaklines/Boundary) when you use them in Revit in any manipulation where the Topography will be modified.
You can also share topography between Revit and Civil 3D to streamline the process of developing, using, and sharing topography data for a project. To do this, you can export a dwg from Civil 3D, link the DWG file in Revit then create the Toposurface.
To link topography over BIM 360 from Civil 3D, you can follow these steps:
Uploaded DWG to BIM360 does not appear when trying to link topography in Revit (autodesk.com)
Let me know if you have more questions on this topic, otherwise please accept as a solution so that others can benefit from this information.
Best regards,
Fulden Yılmaz MSc. Architect - BIM Consultant
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