We don't, but we can have an educated guess (based on other clubs procedures) as to how things work.
Step 1
Levy sets the budget, both for overall transfer monies/wages, and for individuals.
Obviously they'll be some wiggle room with this.
Step 2
Ange highlights what positions he needs, and the type of players he wants.
Step 3
Paratici, Munn, Lange, scouting team etc identify viable targets, let's say 5 for each position.
Step 4
Those targets are presented to Ange, and he then stares his preference numbered 1 - 5.
Step 5
Munn (probably, as Paratici is not allowed to be involved and Lange is "Technical Director") tries to get the deal done within budget.
It's really not rocket science.