Yet another blog
Add Notes and Attachments to an existing object in salesforce
I already created an custom object but when i tried to add notes and attachment to that object i couldnt find a way to do it. Looks like you have the option of doing it while creating the object.. After a bit of searching i found a way to do it.
Go to the page Layout and click Related List… Wow… There is the elusive Notes and Attachment, you can place it on the layout and its visible back on your page