Draw it anywhere (I prefer Powerpoint, then save it as .png), then add it to any model with import, or just copy/paste this .png from the disk to your model. Then, combine this fragment as you wish. In your case, you'd probably need four different fragments for each level
Question that I have is whether adding this as png will help tagging the right model level. E.g. if I add this in all the models and suppose I open a high level [L2] level VAC - would it show the second bar highlighted as Blue.
I was assuming these bars have to be linked to the hierarchy somewhere.
No, they don't. Basically, you have to create 4 (or how many you need) fragments where the respective bar is highlighted. Then you need to assign them to each model manually.
