question about programming PIC 16F84

Hi every one…
I have a question about programming PIC 16F84

Setup ports are as following ..
RA0 to RA4 an input pins
RB0 to RB4 an output pins
Every RAx is an on/off input switch for the output RBx
When RAx goes high and then low the RBx is high and repeats again to get low.
How can I targeting every bit of portb as on/off switch ??
The instruction comf is targeting a full bite While I only have four Bit instructions.

Thank you All

Here's a sample code:

Thank you very much...

And I will try to understand it

Thanx again