If using the "formatted text" option in a Text (created as "text" in a section), then formatting will be retained (WYSIWYG editor). However, there's also a lot of junk in the background (e.g. the font type and size) that I recommend to get rid off.
You will get the best results, if you do the formatting by using some Wiki or HTML code:
More details can be found in the manual about texts.
If you are talking about the text of a question, Wiki and HTML formatting are the only options. WYSIWYG editors too often cause confusion, because there are many situation, when unwanted artifacts from pasting screw up the layout.