congratulation sentense to my general manager..

Since your question is not clear and the reasons of presenting "congratulations" and the background information of your "general manager" as well are not given...... Maybe, I could hardly write any sentence to you at this moment......

I suggest you should post us more information instead!!!

Our most sincere congratulations from all of us!

On behalf of all managers, I am here to congratulate your success in expanding the business to 3 more brands.