1. Go to Diary > Call Types.
   Select the Work Items for the call type you wish to add the Payment Term option to.
   

   

2. Select the Order work item for the Payment Terms to appear in.
   

   

3. In the Order Details page, under Miscellaneous settings, make sure Use Payment Terms is enabled.
   

   

4. Make sure to Save Changes then navigate to the Payment Terms tab.
   

   

5. In the Payment Terms tab, you can reorder the Payment Terms already linked by clicking and dragging on the Reorder column.
   

   

6. You can also link any other Payment Terms you have created via the Link Payment Terms button.
   

   

7. Make sure to Save Changes to apply all changes to the app.