Obviously you don't have enough SRAM for that change. No parameter is going to fix that. Fanuc will sell you the Option.
You can use G90G10 in your programming to do "on-the-fly" offset changes.
ABSOLUTE Changes:
G90G10L2P0XnYnZn (EXT - Affects all offset simultaneously)
G90G10L2P1XnYnZn (G54)
G90G10L2P2XnYnZn (G55)
G90G10L2P3XnYnZn (G56)
G90G10L2P4XnYnZn (G57)
G90G10L2P5XnYnZn (G58)
G90G10L2P6XnYnZn (G59)
INCREMENTAL Changes:
G91G10L2P0XnYnZn (EXT - Affects all offset simultaneously)
G91G10L2P1XnYnZn (G54)
G91G10L2P2XnYnZn (G55)
G91G10L2P3XnYnZn (G56)
G91G10L2P4XnYnZn (G57)
G91G10L2P5XnYnZn (G58)
G91G10L2P6XnYnZn (G59)
G90 - (always return machine to absolute after programming in incremental)
G50 is also a way to shift things, though I'm not versed in G50.