A bulleted item on a slide paragraph sometimes (often?) involves more than one paragraph. This, regardless of whether the paragraphs are long or very short; narrative-wise, there may be two of them. And while they might be partially emulated via line breaks, that does not result in inter-paragraph spacing, nor in the ability of assigning different animation effects to them (e.g. appearing after the previous paragraph in the same bullet). Unfortunately, Impress does not cater to creating them: 1. There's no command (UNO command?) to add a non-bulleted paragraph after the current bulleted paragraph (with the same outline level). 2. There's no command for for making a bulleted paragraph non-bulleted without giving up its indentation. 3. The commands for increasing and decreasing the outline level do not work on non-bulleted paragraphs. Specifically, the Tab and Shift-Tab keys don't work. What we have to resort to is adding a new bulleted paragraph, de-bulleting, and using the ruler to pull the indentation markers to about the same line as the beginning of the previous (bulleted) paragraph. And possibly manually setting the font. I believe at least the last two, and probably all three, of these should be addressed to properly support such paragraphs.
When you write your list, you press Enter after the paragraph is finished. The new next paragraph starts with a bullet (or number in case of numbered lists). Simple press backspace now to remove the bullet and write your paragraph. When you then again press Enter, the next paragraph has again a bullet.
Ok. However... what about other than with the keyboard? Can you do this via the menus or the toolbars?