How should I organize/structure my channel sections?
Some of this depends on what the content is for each item. If all these pages are essentially the same sort of thing, but they differ in how you're categorising them - it's just one channel, and you can use Categories to organise them. Given that it seems you could categorise your content either by "production / development" and also by "Entity 1 / 2 / 3 / 4" it sounds like you may be better creating two Category Groups ("Entities" and "Status"), then creating a Category Field for each, which you add to your Entry Type.

There's not really enough to go on in terms of what content you have to advise much more clearly than that though.