sldprt to cgr conversion covers export between SolidWorks and CATIA, in this particular case between part files (.sldprt) from SolidWorks and MultiCax drawing (.cgr) from CATIA.
Both formats are used for a bit different purpose, so usually not meant for direct export. SLDPRT file contains Solid/NURBS data that CGR format does not use.
You can still find some 3rd party converters that advertise this conversion, but otherwise this is more a job for a skilled person that has knowledge about about both SolidWorks and CATIA.