There are several ways that you can delete a task dependency relationship.
To delete a task dependency relationship using the context menu:
To delete a task dependency relationshipA relationship between two tasks. If a task is completed early or late, this has an effect on the start and end date of the task that succeeds it. in the Schedule pane:
To delete a dependency relationship in the Task pane, the related task must be a predecessor. If the related task is a successor, you must select the Predecessors cell in that task.
To delete a task dependency relationship using the Tasks pane:
Related Concepts
Project Task Gantt (Task Manager)
About Task Dependency Relationships and Lag
Related Tasks
Adding a Task Dependency Relationship
Editing a Task Dependency Relationship
Assigning Resources or Roles to a Project Task
Creating Resource Demands from Project Task Gantt
Associating Project Tasks with Milestones
Configuring Alerts and Restricted Editing of Project Task Constraints
Using Task Notes in Project Task Gantt
Reference