Answer Here is the easy way to find out the exit that fits your requirement.
1.Go to Tcode: se81.
2.expand to the area you are looking at, functionally speaking.
3.select and press F9.
4.Now click on "Repositiory Infosys" button.
5.now you will see a tree form where you can see all the objects (not only exits) under that area. To only see the exits that come under this application;
6.Expand Environment->customerEnhancement->customer enhancement.
7.Double click on Customer enhancement.
8.Execute the selection screen. You will see all the cust.exits that come under your application
9.Double click on the required exit; you can see all the exits that come under that enhancement.