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Having set the dependencies for a project we might want to modify them later! We can do this using the dependency dialog show on the previous page. That dialog can be used to delete or modify existing dependencies between tasks.

Another requested option was to insert tasks (as dependencies between two tasks that have been set as dependent without having to first delete the link and then manually link each of the previous tasks to the new one. There were also requests to delete and swap dependencies. This can all be done using the 'Task definition' option by selecting a task using the right mouse button.

Under the 'Dependencies' tab there are a range of operations that can be performed on the task dependencies

In the frame we can select the two tasks we want to manipulate (when removing/deleting only the first task is operated on) and the operation to perform. No dependencies are actually updated unless we press the 'Update task dependencies' button.

1. Insert before - in the example above we would insert task 4 before task 3 in the project. All previously defined dependencies for task 4 would be removed and any tasks that had task 3 as a descend would be changed so they now pointed at task 4. Task 4 would then become the only preceder for task 3. The descendents of task 3 would remain unchanged.
   
2. Insert after - in the example above we would insert task 4 after task 3 in the project. All previously defined dependencies for task 4 would be removed and any descendents of task 3 would be changed so they now pointed at Task 4. The only descendent of task 3 would become task 4. Any links to tasks preceding task 3 would remain unchanged.
   
3. Swap deps. - the dependencies of the two tasks are literally swapped. Any task that was dependent on task 4 would become dependent on task 3 instead and likewise with task 3. If the two are dependent on each other this is also switched.
   
4. Remove deps. - in the example above any preceders of task 4 would become linked to its descendents and task 4 would be removed from the dependencies.
   
5. Delete deps. - in the example above any links to task 4 would be deleted (the actual task is not removed from the ProjeX sheet).

Before making major changes to the dependencies we recommend you make a backup copy of the workbook (just in case ...).