This article explains how to delete a project
Deleting a Project after Opening #

After opening your project click on the “more” toolbar button in the upper right corner of the main panel, and select the “Delete” menu option (highlighted) and then click “Mark As Deleted”.
Effect of Deleting a Project #
When a project is deleted all the tasks within that project are also deleted. You cannot delete a project if billable time or expenses have been recorded against any of the tasks. In this case either mark the project as complete or transfer tasks that you need to keep to a new project first and then delete the project and its remaining tasks.
Deleting a Project from the Search List #

You can also delete a project from the search list by selecting the project you want to delete and then clicking the upper right “more” button and selecting the menu option “Delete” and “Mark as Deleted” (highlighted).
Click here to find out how to undelete a deleted document.
Effect of Deleting a Project #
When a project is deleted all the tasks within that project are also deleted. You cannot delete a project if billable time or expenses have been recorded against any of the tasks. In this case either mark the project as complete or transfer tasks that you need to keep to a new project first and then delete the project and its remaining tasks.