I have two completely separate glyphs files. The FontInfo for the two has
Family Name: xxx
Style Name: Regular
Weight: Regular
in one, and
Family Name: xxx
Style Name: Bold
Weight: Bold
IsBold: Ticked
in the other.
When I export from the two different files, it always writes a single .OTF file, named xxx-Regular.otf
(Yes, it says -Regular even from the BOLD file)
If I rename the files to keep them completely different, and then try to install in FontBook, it tells me that the fonts are duplicated.
So what obvious thing am I missing that prevents me producing Bold, Regular, Italic and other variants of the font?