Authorization group

Hi

Experts i need clarification on Authorization Group.

while creating marketing plan, marketing plan element, campaign and campaign element in web UI, we have a field Authorization Group for which purpose we will maintain this field and if we maintain any one in this field how the brnad manager or accout manager or sales executive will approve, please give me the advice on this. what are the settings we need to do in this. Please find the below attached screen shot and help me on this.

regards

mohammad