I'm not flaming you, but I'm afraid that I don't quite understand your question ...
If you mean that you want to take a character and split it in half so that it is two separate shapes, like this:
View attachment 134448
There are a number of ways. In almost all cases, you will need to convert your text to outlines (select the text box or path NOT the text itself and hit [CMD]-[SHIFT]-[O]).
I then draw a line (no fill selected) with either the Pen or Line tool over the top of the letter(s). Select both the line and the letter and go Pathfinder -> Divide.
You may need to Ungroup -- [CMD]-[SHIFT]-G -- but you will then have your character or characters split as shown.
It sounds more complicated than it is, and there's probably an easier way that someone else will volunteer.
If that
isn't what you meant, then I apologize ...
Cheers!
Jim