Delete a resource
Go to the Projects page and find the deliverable that contains the resource you want to delete.
Click the deliverable’s button to open the Calculation form.
Find the activity that contains the resource you want to delete and click its button. This will open the resources form for the activity.
Click the resource’s button and the resource will be deleted from the activity.
If you can’t delete the activity, it might be because there is or was planned time, submitted time, or approved/rejected time against the activity.
Even if you delete the planned time, you still can not delete the activity.