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Save the file as '.model' for importing to patern.
After designing a model in CATIA first we have to save in as IGES file or STEP file. Then in Patran open File-> import->select IGES or STEP->Tick the box that will ask to convert it in parasolid then press OK the required model will import in PATRAN.
I have used patran but most of the design/analysis softwares should be able to import geometry files in STEP/IGES format. Try to check whether these formats are listed in File->Import command. Hope it helps.