TPC is not a CAD program. It uses its own Quick View Technology to produce drawings. However, it does interfaces with CAD, as discussed in this topic.
Beginning with TPC Desktop 2016, TPC now includes a native CAD viewer, called the CAD View. This view will open DWG, DXF and DGN files directly, witthout the need to import them into a TPC drawing.
Once opened, you can explore the CAD drawing using zoom, layer and list tools. You can also share data between the CAD View and TPC's Drawing View.
The CAD view supports model space and layouts. You can select which layout to use right from within the CAD View.
You can import DWG, DXF and DGN files into a drawing. TPC converts the CAD entities into it's own drawing objects. Once imported, you can use use the drawing tools to extract information about the CAD entities or convert them to traverses.
TPC does not import laytouts into it's own drawings. All objects imported from a CAD file are imported model space objects.
Once you have created your drawing in TPC, you can export it as a DWG, DXF or DGN file. TPC exports a rich CAD file with layers, blocks, polygons, etc. as if the drawing had been created originally in a CAD program.
Both paper space and survey space objects in the drawing are exported to CAD files as model space objects. TPC does not export layouts to CAD files.
TPC stores its own blocks as DXF files. If you create a new block, TPC will store it in a new DXF file.
For the most part, TPC uses standard DXF entities, so if you create a block in a CAD program, you can probably re-use it in TPC.
You can reuse your existing CAD blocks as blocks in TPC's drawings. This is because TPC uses the DXF file format for its own blocks.
TPC stores blocks in the \Blocks\ folder of the program data folder. If you haven't modified the location, it will be C:\ProgramData\Traverse PC\TPC Desktop 2017\Blocks\.
Within this folder, TPC uses sub-folders to organize your blocks. So the sub-folder \Point Symbols\ is where TPC stores its point symbols. The sub-folder \Title Blocks\, stores its title blocks.
If you have a library of blocks you use in your CAD program, you may be able to copy their DXF files into TPC's blocks folder.
From the Drawing View, you can also choose Tools | Get Blocks From Drawing. From this dialog, you can select a DXF file from which TPC will strip the blocks and place them in TPC's own \Blocks\ folder.
You can also import DXF files directly into a survey. TPC strips any coordinates out of the DXF file, assigns them a unique point label and adds them to the survey.
TPC imports and exports CAD surfaces. These are PolyFaceMesh objects for Autodesk files and MeshFaceLoops for Bentley files.
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Autodesk DWG Files
Autodesk DXF Files
Bentley DGN Files