Adding actions to a project
Add actions to a project whenever you think of something that you need to do in order to move the project forward. Most of the time you’ll probably want to add actions using the inbox or the quick entry window, but of course you can also add to the project directly.
To add an action to a project:
Make sure you are in planning mode; an easy way to get there is by clicking the Projects button in the toolbar: 
Select the project, either in the sidebar or in the main outline, by clicking the index-card icon next to its name. Or, select an already-existing action in the project.
Press Return or click the Add Action button in the toolbar; the new action appears immediately after the item you selected.
Type a name for your new action.
You can move an action between projects by clicking its bullet and dragging it to its new location. You can even turn an action into a project by dragging it to the top level of the outline or the sidebar.