This thread is a good read
http://www.picbasic.co.uk/forum/showthread.php?t=543

For an example the best place to look will be in the file the above thread speaks about. The inc file for the chip you are using in the PBP directory.

To find all of the options for the chip go to - program files - micro chip - mpasm suite and find the inc file there for your chip. Do not change anything in this one. Look near the end of the file for all of the config options.