To bulk delete resource assignments in Resource Planning.
Resource assignments allow you to manage your team by assigning resources to projects.
Resource assignments can also be used for forecasting and planning future work. You can keep these assignments private until you are ready to notify the assignee or other members of your team.
You can bulk delete assignments in two places:
You can bulk delete assignments by creating a category (or subcategory), moving the assignments into the category, and then deleting the category:
 next to the project and click Add Category.
 next to the project and click Add Category. next to the category and click Add Subcategory.
 next to the category and click Add Subcategory. next to the category or subcategory and click Delete Category or Delete Subcategory.
 next to the category or subcategory and click Delete Category or Delete Subcategory.Deleting a task on the Gantt can be undone by clicking the undo  icon, so long as you remain on the Gantt and stay within the same session. However, if you navigate away from the Gantt or your session expires, the task is permanently deleted.
 icon, so long as you remain on the Gantt and stay within the same session. However, if you navigate away from the Gantt or your session expires, the task is permanently deleted.