How to generate custom .otf font subset file?

Question

How to generate custom .otf font subset file?

Use case:

1. There exists gauge .otf font file.
2. There exists specific Unicode glyph set (ranges, points).
3. Output is new .otf file sufficient for set from point 2.

How do this on .NET or JavaScript?

Answer 1

Simply check this answer but instead of saving to .ttf save it to .otf.