Deleting Measurement Systems
Delete a measurement system in one of the following ways:
• Selecting Delete 
from the right-click actions menu for a measurement system in the navigation pane.
from the right-click actions menu for a measurement system in the navigation pane.• Selecting Delete from the Actions menu of the measurement system information page.
from the Actions menu of the measurement system information page.When prompted, click OK to confirm the deletion.
When you delete a measurement system, it is no longer available to any Windchill application that uses it. If you delete all the measurement systems, all units return to the default system, SI units.