1) First Save Drawing then Export to AutoCAD format then in Revit Select insert in Ribbon Above and link CAD select Units and finally Origen to Origen Select for Coordinates.
2) From the "Massing and Site" ribbon tab, choose Topo surface From the Modify | Edit Surface" ribbon tab, choose "Create from Import > Select Import Instance
Now select the linked DWG file
When the layer list appears, click "Check None", then select only the layers containing the topo surface you wish to import. Note, if you have multiple topo surfaces it is recommended to import one by one, repeating the process and choosing every time a single layer containing the surface
Click OK when done then click the "Finish Surface" button in the Edit Surface ribbon tab to complete the creation of your topo surface.
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