Connecting remote bahmini servers to a main sever

Greetings , I know that topic have been address . but I am not , unfortunately a developer. Can someone please give me a step by step to how I can connect 3 remote Bahmni server together . I run 3 different clinics and would like local servers to be connected to a main central server . Again would like step by step instructions . Thank you and again congratulation for your good work !