how to search for enhancement(user exit) or BADI?

what r the steps? first..? second...?

about maintain source list and maintain quota arrangement, r there any enhancements here? or BADI? how to look up, so that i can add my code into it, and to enable my code automatically executes once the end-user finishes maintaining source list and quota arrangement.

thanks so much in advance u guys, i really appreciate ur help here;)