Deleting resource and cost allocations in the assignment view

You can remove a resource or cost allocation from a task by doing either of the following:

Selecting the allocation in the assignment grid, then clicking in the assignment view's toolbar.
Right-clicking the allocation in the assignment grid, then selecting Delete.

To delete every allocation of a particular resource or cost centre, right-click the resource or cost centre in the assignment view tree, then select Delete. Every allocation of that resource or cost centre, and the object itself, is deleted from the project.