1) Go to Management > Projects > Manage Projects > Select the Project you want to modify
2) Under the Other Project Setting section is a link called Modify Entry Column Dependencies, click that. 

3) You'll see two columns of list boxes, under the the pay type section select the pay type you want from the left box, then click the Change Dependencies button.
4) The page should update and you should be able to see the pay type in right hand list box