I know this has been answered, but I can't find the info anywhere. I want to do a solo run on MM6, which I've generally done by just killing 3 characters in New Sorpigal but I want to go the save edit route this time. Anybody have directions for me?

I read the patch notes for GrayFace's MM7 patch, and it included an option to reduce your party size. The MM6 version of it might have the same option. It would likely be more reliable than editing the save file after the fact, unless you wanted that sweet starting gear.