To rebuild a Shared Parameter file, use the Export option from Family or Project

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In the Parameter Properties dialog, click Export.
Note:  The Export option is not enabled if the selected parameter is already in the current shared parameter file.A message displays informing you that the shared parameter will be exported to the shared parameter file you set up in Step 1.


Here is the rest of the how-to:
Exporting Shared Parameters to a Shared Parameter File - WikiHelp