I just tested with a Devanagari font.
First, make sure you have the latest version of Font Creator from the announcements forum.
- Open your font. Don’t select any glyphs unless you want to leave some glyphs without a slant.
- From the tools menu, select Glyph Transformer
- Remove all transformatons from the right panel
- Add the Skew transformation
- Click OK to skew all the glyphs in the font
If you’re not quite happy with the result, you can try different values for the skew. Note that this poweful feature lacks any undo option. The only way is to close without saving and reopen the original font.
You will, of course, have to save your new font under a new TTF filename, change some values under Format, Settings to identify it as an italic variant, before using the autonaming feature to rename it.