> You are correct, you would store the number as three bytes. You might
name
> them Number0, Number1, Number2 to respresent the three bytes which
contain
> the values.  Multi byte arithmetic is pretty straight forward.  It's
covered
> in various application notes on the Microchip website.

This is a personal preference, but you don't need to name every byte of a
multi-byte number.  For example, I would define it like this:

number res   3

That would reserve 3 bytes with NUMBER being the address of the first.  As
an example, I would write the code to increment the 3 byte number by 1
like this:

       incf  number+0  ;increment the low byte
       skip_nz         ;didn't just wrap back to 0 ?
       incf  number+1  ;propagate carry to middle byte
       skip_nz         ;no further carry ?
       incf  number+2  ;propagate carry to high byte


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