Look in the .bas file for the chip you are using.
If it's a 16F877A then open c:\pbp\16f877a.bas

The PORTL and PORTH aliases are used for the PIN numbers (0-15)
PORTL is 0-7 and PORTH is 8-15.
Code:
PORTL   VAR     PORTB
PORTH   VAR     PORTC
TRISL   VAR     TRISB
TRISH   VAR     TRISC
If PORTH is aliased to PORTC then you don't need to do anything.
If it's not, change it to PORTC, and change TRISH to alias TRISC.

Then you can use the PIN numbers to access the pins with a variable.
Code:
    If DS1=1 then
	ComVar=14   ; PORTC.6
	Else
	ComVar=13   ; PORTC.5
    EndIF

    Serout2 ComVar, 84, [“  Com is PIN - ”, DEC ComVar,13,10]