In Glyphs you have access only to a small subset of font info. This is to simplify the setup.
Glyph names are automatically converted to a readable name (e.g. if you input "afii10017", it will be converted to "Acyrillic").
If you don’t know the exact glyph name but the unicode value, you can use "uni"+unicode index. (e.g. uni0410 for the cyrillic uppercase "A").
Goto "Menu" > "Font Info" > "Font"
Set the base family name in the "Family Name" Field.
Goto "Instances"
If there is no Instance, add one with the
in the lower left corner.Set the values as needed.
The Grouping is there to build windows style linked families (Regular, Italic, Bold, Bold Italic).