Besides deleting one single task from your project,
you also have the possibility of deleting multiple tasks at a time.
achieve this, select multiple consecutive rows using either CTRL or
SHIFT keys on your keyboard and then click on Delete option from the
Task menu, or press on Delete key or use the Delete Task option from the
contextual menu to delete multiple tasks at a time. The IDs of the remaining tasks will be automatically renumbered.
Note: Be carefull when deleting multiple tasks in your project, as it may affect your schedule and you may loose some information you inserted in your project.
You can restore the multiple tasks immediately after you deleted them, by using the Undo option under Task tab.
Select a group of two tasks in the task grid using the SHIFT key
for multiple selection. As you can see below, the selected rows are
highlighted with blue background.
Then right click on a task ID belonging to the multiple selection, and from the contextual menu choose Delete Task option.
As a result, the two selected tasks will be removed from the project, and the below tasks will have their IDs renumbered.