The output of the hardware PWM module in the 16F628A is on PORTB.3. Hence this the only pin you can use for the PWM output.
Do you need exactly the same signal on 8 pins? If so, you can just take multiple connections from the same pin (PORTB.3).
If you need 8 Different PWM signals, you could use a software interrupt based routine.
You can have a look at Darrel's Multiple Software PWM.
http://www.darreltaylor.com/DT_INTS-14/SPWM.html
He has included a very nice description on how to use it.