I am working on a typeface in Fontographer and I have decided to use some character slots for pictograms and not the character that was intended to be in the given slot. I was advised to unencode them. I have about 8 icons I want to do this with. They will replace characters like the Greek summation, product, and pi. I have searched and cannot find information on how to unencode in Fontographer. I am rather new to using font design software and the technology behind it. Any advice would be appreciated. Thank you.