You mean the SAVE_EEP command to store into FRAM memory? Yes, it can only save 16-bit number.
You can however use the GETHIGH16 command to break a 32-bit number (one of the A to Z or EMLINT[1] to EMLINT[16]) into two 16-bit numbers and store into the FRAM memory. You then need to use the SETHIGH16 to reassemble two 16-bit number loaded from the FRAM into a 32-bit number.
See the "EEPROM.PC6" example in the C:\TRiLOGI\TL6\usr\samples folder.