Audio in Pool Edit version confusion

Need a bit of help here, trying to understand the proliferation of edit versions, many not used, but with events scattered among the others. I’ve been doing a lot of warping so I presume that’s where they’re from but what do they actually contain? The warp data at the moment that event was created? Is it possible (or even a good idea) to rationalise these into single file? And how come new Regions I have created have appeared in all edit versions but not the original (which is where I’m sure I created them but maybe not)

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And another thing: which of these versions or their regions do I drag into the project?

Thanks for any pointers.