Do-more has very powerful casting mechanism. For bit of word in a numeric, just use the normal name (not B) followed by : then bit number (0 is Least Significant Bit)
V0:0 LSBit of V0
R42:31 MSBit of R42 (R is 32 bit IEEE floating point)
The Element Browser (F9, then F9 again if it didn't show up) has a Cast Builder helper. At the bottom right of the Element Browser, hit the Show Cast Builder button and this shows you how to cast just about any type to any type, e.g. DLV to REAL or MHR to Signed DWORD or X to Unsigned WORD or ...