Version Maintenance of Program

Dear All,

Want to know, scenario........

Client in Dev.

102

104

400 all cross clients.

Prod

500

Suppose a request is released in 102 it gets affected to all the clients by default( in dev). Now the problem starts if something is developed in dev and that is not transported to production. So there was some change in dev which is not gone to Prod(500),. How to maintain the version change status in prod and dev. If there are any request or changes to effect any module/Sub module???

Is there any report. And how to take care of the changes made in dev and keep track of the programs ? Also al the relevant question regarding the same?

Regards

Prash