CAESAR II has quite a few CAD interfaces. From the Main Menu, select "Tools\External Interfaces" to see the complete menu.
With regards to Autoplant, yes there is an interface. Within Autoplant, generate a PCF file. Then, in CAESAR II, use the "External Interfaces" menu and select the PCF interface. This will allow you to read in the PCF neutral file and create a CAESAR II neutral file.
At the moment there is not an interface between CAESAR II and Solidworks or Pro-Engineer. The CAESAR II - CADWorx system is by far the best to use, because the data transfer is seamless and complete in both directions. There are a number of articles on this web site describing facility.
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Regards,
Richard Ay - Consultant