I saw this tip on the Vectorworks discussion list. I looked into this a bit more, and I have added screen shots so that it makes more sense.
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We often have to work with consultants and clients that do not use Vectorworks. DXF or DWG (AutoCAD) is usually the best way to do this. It will allow the you to use their information in Vectorworks, or it will allow them to import your work.
Exporting for 2D Using Design Layers.
Exporting for 2D Using Sheet Layers
Exporting a 3D Model. DXF/DWG does not understand a hybrid object. So when you export, you have to choose to export the 2D parts of the file, or export the 3D parts of the file. You can not export both (easily).
Importing For Workgroup Referencing. There are times when you are working with a consultant that keeps wanting to update the drawings. Every time the consultant updates the drawings, you will have to update your files. This can be a real hassle if you import the consultants drawings and work on them, as in the above example.
Importing For Roundtrip (landscaping). There are times when you are working with a consultant that wants you to send your work back to them. This can be a challenge as you might end up sending them their work back again, when you don’t want to.
Class and Layer Mapping. Class and Layer Mapping is a command that allows you to merge layers and classes together. You can use this to merge all the imported classes into the classes of your choosing.
Import from a Consultant, Can’t Get the Scale Right.
Importing Multiple Files From the Internet. In this case, you just download several files from the same manufacturer.
Importing Multiple Files From the Internet, Import as Symbols.
In this situation, you want to import the drawings from the Internet, use the details in your drawings, but there is no need to send the drawings to a 3rd party.
Improved DXF/DWG reference import support: xRefs are now imported as referenced design layer viewports (Design Series products) or layer links (Fundamentals). DXF/DWG import saved settings: Vectorworks have added a saved settings capability so you can recall saved sets of import options.
Importing a DXF file that has oversized arrows.
Importing Details From A Manufacturer
How to deal with importing a CAD file from a manufacturer.
Importing a DXF/DWG file from a surveyor.
Importing the Architect’s updated drawings.
Usingthe HVAC tools to add ductwork on top of the base drawing.
starting with importing a DXF/DWG file to get the base plan of the building.