What is a dependency?
"Dependencies are the relationships among tasks that determine the order in which activities need to be performed. With task dependencies, you can mark a task as blocking another task, or blocked by another task."- Asana
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Click "Details" next to the task you want to create the dependency for.
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Click "Add dependencies"
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Select the task you would like to use as a block to the current task.
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Click "Close details"
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Select the task you have now used as a block.
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When you open the details pane, you will see that this task is now blocking the first task we looked at.