While TransMagic does natively support the reading Pro/E part and assembly files, it does not support the writing of native Pro/E part and assembly files.  However, Pro/E can read STEP *.stp, Parasolid *.x_t and ACIS *.sat files all of which TransMagic can write.  So you can write out any of these formats and read them into Pro/E.

Our customers have frequently reported to us that the best format to start with out of these formats is the STEP *.stp format, then try ACIS *.sat and finally Parasolid *.x_t.