May be something like this could help you.

Code:
<font color="#000080"><i>'============== Name Pins =================
</i></font>A <font color="#000080"><b>VAR </b></font>PORTB.<font color="#FF0000"><b>7
</b></font>B <font color="#000080"><b>VAR </b></font>PORTB.<font color="#FF0000"><b>6
</b></font>C <font color="#000080"><b>VAR </b></font>PORTB.<font color="#FF0000"><b>5
</b></font>D <font color="#000080"><b>VAR </b></font>PORTB.<font color="#FF0000"><b>4

</b></font>MyPort <font color="#000080"><b>VAR BYTE
</b></font>MyPort <font color="#000080"><b></font>=<font color="#FF0000"><b> 0</b>

</b></font>Loop:
     <font color="#000080"><b>GOSUB </b></font>SetPins

     <font color="#000080"><b>IF </b></font>MyPort = <font color="#FF0000"><b>2 </b></font><font color="#000080"><b>THEN </b></font>SayHello   <font color="#000080"><i>' Example to use pin assignment.        


     </i><b>GOTO </b></font>Loop

SayHello:

      <font color="#000080"><b>LCDOUT </b></font><font color="#FF0000"><b>$fe</b></font>,<font color="#FF0000"><b>1</b></font>,<font color="#008000"><b>&quot;HELLO&quot;
      </b></font><font color="#000080"><b>PAUSE </b></font><font color="#FF0000"><b>1000
      </b></font><font color="#000080"><b>GOTO </b></font>Loop


SetPins:
    MyPort.<font color="#FF0000"><b>0 </b></font>= A
    MyPort.<font color="#FF0000"><b>1 </b></font>= B   
    MyPort.<font color="#FF0000"><b>2 </b></font>= C   
    MyPort.<font color="#FF0000"><b>3 </b></font>= D   
    <font color="#000080"><b>RETURN

 
END

</b></font>