Shelving projects or tasks？

Whether the project and task can be set up on hold or not is not suitable for further execution because the conditions are not yet ripe, but there is possibility of execution in the future, so it must be set aside before the conditions are ripe.

Means: the project, task will be hidden in the need, not reminded, not displayed, need to be re-executed to activate the project, task. He's different from deleting, because once you choose to delete from the need, you have to back up in case you need to.