You probably already know about ordinary edging: Where you bring yourself close to the brink, and back off a few times. When you are good at this, you can have interesting and very enjoyable partial orgasms. Sometimes you feel contractions but don't ejaculate. Other times you may actually squirt a little something. In both cases, you're still ready for more - you don't lose that 'want to cum' feeling. I'm working on learning to go even beyond that. Here's the technique I'm currently working with:
First, you do some ordinary edging, more or less staying closer to the lower extreme of the experience. In other words, you're staying pretty well away from losing it and ejaculating. But, you're getting to the point where you feel the contractions from time to time.
Now, for level two: Go to the point where you feel contractions, where you may (or may not) get extra pre-cum or even maybe little squirts of sperm, but then don't back off for as long. Don't let the feeling totally subside. Work with the idea of staying in the orgasm itself, but not ejaculating. It can be done, and it is great! So far, I have lasted for perhaps 2 minutes in a more-or-less non-ending orgasm. So far, at the end, I have always ejaculated. I suppose it would be even better, bolder, stronger, greater, whatever you want to call it, if I could stay in that actual orgasming zone for a good few minutes and NOT cum, then go back to the lower levels for a while, come back up, and so on.
Have fun! - Regular Guy