its doesnt work like this in PLO. you dont really go for % ranges because you cant really say whats a top20% range for example, because starting hands are much more complex in PLO. Its much more important that you understand which hands are strong in what situations and why. A good starting point for this is maybe the PLO from Scratch series which you find, when you google it or the book "PLO: the big play strategy" by Jeff Huang, which tries to classify the hands in PLO a bit but is much too tight for 6max imo. 

Step 1, learn to identify solid values for various spots, and what is not. When to push equity and when to play for implied odds. When to push players out, and when to pull them in.

Examples:

UTG opens and gets called, you overcall AA72ss in BB because you don't want to play a bloated multiway pot OOP with a hand that doesn't hit many flops.

CO opens and you have 9765ds on the Button. You 3-bet because your hand plays well HU in a 3-bet pot, and not so well if you flat and pull in the blinds. With AQJ6ss (suited ace) you would have flatted for pretty much the opposite reasons. With KQJ6ss suited to the jack you would just fold because it doesn't play well neither as an iso 3-bet or multiway flatting hand.

And so on and so forth. Train yourself to see such obvious spots. Ask yourself how your hand is going to make money, and the optimal choice is usually easy to see. Step 2 is to fine-tune and learn to pick the best option for the legions of hands that are not super obvious. 

Like, how raggedy a rundown can you 3-bet in position? How loose and bad does the opener have to be before you consider 3-betting to isolate with an ABBx dangler hand? How nutty does a 3-bettable/flattable hand have to be to make flatting and inviting other players in a better option than 3-betting to isolate?

And we haven't even started to think about stacks and opponent tendencies yet, which also influences your decisions a lot.

This takes tons of playing experience to figure out. But learn to identify the obvious spots well as Step 1. Then tweak and fine-tune your play of in-between hands.

One of the many beauties of PLO is that preflop play is not cut and dried. You have lots of room to vary your play according to subtle nuances in the situation. This is why PLO never gets boring. :-) 

If you are new to PLO and have these kind of questions I would look at getting leak buster for PLO.  It's a very good starting tool for reviewing your play, has about six or seven videos on these basic conceps (preflop play, 3b/4b pots, cbetting, etc..).  Also it breaks down your play by hand types, positions so you can see where you are over valuing hands and there are a lot of good filters to analyze your game with.