The PMC-Map sheet is a map between a given Piping Material Class to the Smart 3D specification.
Piping Material Class - Type the PDS Piping Material Class from the .xml file.
S3D Spec - Type the corresponding Smart 3D piping specification, available under the Piping task in Smart 3D.
If the XML Spec is not mapped in the PMC-Map mapping sheet, then the PDS software assumes that the piping specification is present in Smart 3D. The software then tries to import the pipe run with that specification.