Importing Documents
To import a file from another application:
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Click Open 
or File, Open.
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In the dialog box, select a format for Files of type (for example, DWG (*.dwg) files, IGES (*.igs, *.iges), STL (*.stl), and so on).
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For file types with import options, click Options. In the Import Options dialog box, specify the options, then click OK.
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Browse to a file, then click Open.
The selected file is opened.
You can choose to import the file to a sheet in native format (view-only) in addition to importing it to a part or drawing document.
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If there are surfaces in the file, they are read as follows:
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If there are blanked surfaces, they are imported and added to the FeatureManager design tree as surface features.
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If the attempt to knit the surfaces into a solid succeeds, the solid appears as the base feature (named Imported1) in a new part file. You can add features (bosses, cuts, and so on) to this base feature, but you cannot edit the base feature itself.
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If the surfaces represent multiple closed volumes, then one part is made for each closed volume. An assembly file also is made that includes the imported parts positioned relative to the assembly origin, according to how the surfaces are defined in the imported file. For ACIS files, if the imported ACIS file consists of surfaces only, then only surfaces are created even though they represent multiple closed volumes, regardless of the import options you choose. If the ACIS file consists of data about multiple solid bodies, parts or surfaces are created, depending on the import options you choose.
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If the attempt to knit the surfaces fails, the surfaces are grouped into one or more surface features (named Surface-Imported1, 2, ...) in a new part file.