Hello George,
Thanks for your reply.
At first, I must admit that I'm not proffessional user, so I can misunderstand some important things...
All form fields using MyFont-Bold font.
I change only plain text wrote by MyFont.
In example in document there is a text "Enter your first name here" wrote by MyFont font. I'm editing it to "Your name is" (using MyFont too). Save document.
And then in the document appears new font subset called... MyFont.
So after editing that document contains 3 font subsets:
(1) * MyFont-Bold, TrueType (CID), Identity-H (which was previously embedded)
(2) * MyFont, TrueType (CID), Identity-H (which was previously embedded)
(3) * MyFont. TrueType, Ansi (new added after editing)
The (3) font contains only 2 glyphs "i" and "s" (because I added "is" to the text), however the (2) font also contains that characters.
My problem is: how to prevent Acrobat from adding third subset?
How to force Acrobat to use glyphs from the second subset instead of adding new one?