To remove customization data created in the Workbench from a project:
Do one of the following:
On the Projects tab, go to Projects and click on Your Project Name. In the Content for Indexing section of the project page, click the Manage Content link.
On the Projects tab, go to Your Project Name > Content.
Click the Remove icon () for the customization.
Note that removing a customization from a project does not delete the customization, but disassociates it from the project. The customization can still be used with other projects.