Hello,
SAM does not have a mechanism for importing PVsyst .pan files. This may be possible in the future, but is not at the moment because the .pan file format is a binary format that only PVsyst can read.
If you have the module parameters required by the CEC or Sandia module models or the Sandia inverter model, you can add items to the libraries as I describe above. Each library is a CSV file, and you can add rows to a file to add items.
You can also use the module "CEC Performance Model with User Entered Specifications" or inverter "Inverter Datasheet" to model equipment that is not included in the libraries. Those allow you to model a module or inverter using only data from a manufacturer data sheet, so you don't need the additional parameters you would need to add them to the library. Note that if you have IEC 61853 test parameters for a module, you can choose that option on the Module page.
Best regards,
Paul.