If you have created the planning elements in a chronological order, you can link them with just one click and create dependencies between the planning elements. That way, you create a project plan based on the waterfall model.
1. Click on the planning elements you want to link. Use Ctrl+A to mark every planning element in your plan.
2. Open the tab Edit and click on Link Automatically in the ribbon in the section Action.
3. The marked planning elements are now linked.
Proceed to edit the dependencies.
4. If you want to undo the automatically created dependencies, mark the planning elements whose link you want to undo and click on Remove Dependency in the tab Edit in the section Action.
Or click on the undo symbol in the Outlook tool bar in the upper left-hand corner.