I think I can help you with this. From Setup, choose your incident object. Scroll down to the section on Page Layouts and select/edit the one you want to modify.
Next select Related Lists and then Notes & Attachments - to the right in list.
Drag selection down into Related Lists section of page and drop where you want it to appear.
Then go back to the top and save the page layout.
Hope this is what you were looking for!
Thanks Leslie Tilton. Its really very helpful.
You are very Welcome!