To remove resources from a workset, display the contents of the workset in the Resource Explorer. Select the resource or resources you want to remove from the workset, and then choose Remove Resources from Workset from the Worksets button drop list in the Resource Explorer toolbar. The resources will be removed from the selected workset. No other worksets will be affected.
When you delete a resource from the dictionary, it is automatically removed from any worksets it is part of.