You cannot remove a value list, life cycle, or phase that is in use by another object. However, you can disable them. You can then hide all disabled information. You can also disable an alert, which will prevent from the alert's email to be dispatched.
To disable an object:
- From the Setup drop-down list, select the hierarchy that contains the object you want to disable.
- In the selected hierarchy, select the object you want to disable.
- On the menu bar, there is a menu with the name of the hierarchy. For example, if you are in the Phases hierarchy, then there will be a Phase menu. From this menu, click Disable.
- To view disabled objects, from the View menu, click Show Disabled. All disabled items are grayed out.
- To hide disabled objects, from the View menu, click Hide Disabled.