system refresh from production to development and quality

Hi dear Gurus,

I am new to basis and in my organization i have been given a task t odo system refresh from production to quality and development.

please tell me that we have to delete the current client in dev and qty before doing the system copy.

please tell me what are all the precautions and system copy steps to be performed to finish this activity.

Many thanks for your time.

Kind Regarsd,

Vamsi.