CELL to MX MACRO SYMBOL converting

Hello.

I need convert some MSTN cells to MX MACRO SYMBOL. I tried to insert cell to drawing and then select cell and select FEATURE SET  in some MODEL. CELL MAPPING window was viewed and i select MACRO and OK. In default macro folder .../XX_macros/ is not new macrosymbol like anywhere. Have you anybody correct instructions for MSTN CELL converting? 

I use Bentley MXROAD V8i (SELECTseries 2) - 08.11.07.536

Thanks