Reading multiple bit state in one modbus address

Hi, I need support with a mod bus configuration. I’m trying to read the single state ( 0-OFF, 1-ON) of a bit in a single mod bus register.
modbus configuration is address 100 with 4 bit to read (“bit6: 0=off, 1= on”-" bit7-bit8-bit9).
Anyone can help with the configuration?
thanks