How to fold part of a line?

[prehistoric-penguin]

I am trying to fold part of a line in notepad++, but after googling I find that it seems notepad++ can only fold whole lines. Can I accomplish this through writing some plugins? Thanks for your help!

I just want this line:

[head_field1][head_fileld2] content

To be
+ content

And I can unfold it at will.

[dail]

This is not possible. Internally Notepad++ uses Scintilla for all the text handling/highlighting/folding/etc and that does not provide anything other than folding entire lines.

[prehistoric-penguin]

Thanks a lot!