I'm currently designing a step-by-step wizard, where the interface tells the user which section of the wizard he/she is visiting, using Progress Trackers, like the image below.
The user can navigate through each Step, back and forward and also jump between Steps that are already complete (ex: on Step 3, jump to Step 1)
Now the challenge is that those steps have sub-steps inside, for example, for the user to complete the Step 3, he/she needs to fill four sub-steps that are related with that Step 3, like this:
My question is...
Having Progress Tracker with 2 levels, which the user can navigate through, is a flow that is familiar for the user? If so, is there any usability issue that I should be aware of?