All GPR's are bit addressable, just use the name you gave them when you allocated them. You 'could' use the specific address, but it would be pretty silly, and exceptionally bad practice.
For example, this is from one of my tutorials.
Code:
bsf Flags2, New
and from the setup at the beginning of the program.
Code:
cblock 0x20 ;start of general purpose registers
count ;used in looping routines
count1 ;used in delay routine
counta ;used in delay routine
countb ;used in delay routine
LoX
Bit_Cntr
Cmd_Byte
Dev_Byte
Flags
Flags2
tmp1 ;temporary storage
tmp2
tmp3
lastdev
lastkey
endc
New Equ 0x07