[dba-Tech] automated bullets

Does anyone know if there's a way to control the leading before and after automated bullets in any of the Word applications? I'm just beginning to look around and I've never looked before -- this doesn't sound like something I'm going to find. Here's what I got from the reader (don't know what scrunch-up feature he's talking about though: 

"Hey, if you are the 'How do I' guy, then maybe you can do another thing
that I have trouble with in Powerpoint. It is the space between the
lines. When there are bullets, sometimes there is lots of space between
the lines. Sometimes there is much less. I don't know what's causing the
difference. Doesn't seem to be the font size.

"I know there is a 'scrunch-up' command (and an 'un-scrunch-up'
counterpart), but you use that more than once or twice and the text
begins to get obscured."

I probably don't need really specific instructions, but if someone knows how to control this space, please point me in the right direction. Thanks!

Susan H.