If you go into the "DEVICE_REFERENCE" folder of your PBP3 install directory you will find a bunch of files *.INFO. Find the file that relates to your PIC and open it to find a complete list of all the config options with descriptions and an example of how to use the settings in PBP3, e.g for PIC16F1509
; Available __CONFIG labels for PIC16F1509:
;
;CONFIG1 Options
;
; Oscillator Selection Bits
; _FOSC_ECH ;ECH, External Clock, High Power Mode (4-20 MHz): device clock supplied to CLKIN pins
; _FOSC_ECM ;ECM, External Clock, Medium Power Mode (0.5-4 MHz): device clock supplied to CLKIN pins
; _FOSC_ECL ;ECL, External Clock, Low Power Mode (0-0.5 MHz): device clock supplied to CLKIN pins
; _FOSC_INTOSC ;INTOSC oscillator: I/O function on CLKIN pin
; _FOSC_EXTRC ;EXTRC oscillator: External RC circuit connected to CLKIN pin
; _FOSC_HS ;HS Oscillator, High-speed crystal/resonator connected between OSC1 and OSC2 pins
; _FOSC_XT ;XT Oscillator, Crystal/resonator connected between OSC1 and OSC2 pins
; _FOSC_LP ;LP Oscillator, Low-power crystal connected between OSC1 and OSC2 pins
are the config options for the oscillator. When you install PBP3 it has the option of installing the correct assembler if not already installed.