I would like to ask about the most efficient method if I want to generate diacritics for an a.ss01 but I’ve already generated for a. Should I do it manually and copy paste e.g. the breve for this new character and then name it abreve.ss01?
If you don’t have the glyphs already: Duplicate the glyphs (to get abreve.001 and so on). Then find and replace the .001 to .ss01.
Then select them and run ‘Glyph > Create Composite’. It will pick up the .ss01 variants if available.