Index register in melsoft plc

Hi,
In Mitsubishi you can use the index register to change a device number, e.g.:

z2 := 2;
M2Z2 :=0; (*i.e. sets M2+2, M4 = 0*)

Does anyone know if you can use this with bit number addresses, i.e.

D0.1 , then shift to access D2.1 or D0.3.

This would be very useful as i'm trying to convert from S7 to MELSOFT. Any help would be much appreciated...
Thanks

As far as I know this is not possible, however you can move a register into bits & back using mov D4 k4 M100 this moves the 16 bits of D4 to M100-1015 so by indirect addressing using the Z registers you could load Dxx into Mxx set the bit required then move them back or even vice versa.
also you could use masks to set or reset bits in words