PR Release Strategy

Dears,

We are getting the problem in setting Release Strategy with classification. We are using Purchasing Group and Document Types as characteristics. We have created the release codes/groups as follows:

Group A: Manager Tech, Manager Maint

Group B: Manager Sales, Manager Marketing

Group C: Manager HR

We want to give authorization to GM as follows:

1. If either Manager Tech or Maint Manager approves a PR then GM Operations has to approve that.

Similarly for other managers also.

After that it will go to Chairman. How to confgure this. Pls help. Thanks.