FI Configuration and Reporting - two company codes in different client in same server

Hello Experts

We have to configure extended withholding tax for two companies of same group. Both companies are in different client.

For Ex:

Company Code 1100 is in - Client 110 (in development server), Client 210 (in quality server), Client 310 (in production server).

Company Code 1200 is in - Client 120 (in development server), Client 220 (in quality server), Client 320 (in production server).

My question is

1. Whether I will have to do configuration in both the client or just do in client 110 and then transport directly to 120?

2. How will I get consolidated reporting for both the company code?