The main font that I'm using for a project lacks OldStyle numbers, and I would really like to add them from a different typeface (one whose numbers I think complement nicely with my original font). Both fonts are in OTF format.
Can I do this in FontForge (or other similar free software)? I.E. copy the old style numbers from a second typeface and add them to the first one as an OTF feature? If yes, how?
I've never used FontForge before, so I'm looking for detailed answers suited for a beginner.