Move the cursor to the tab of the measurement system you want to copy.
Click the right mouse button.
Select Copy... from the pop-up menu.
The Copy Measurement System dialog box opens.
Enter the name of the new measurement system in the Destination field.
Result: A new measurement system tab will be created with the name you specified.
If there are existing Unit IDs in the left pane, you will see default values in the Equivalent Unit ID, Forward Equation, Reverse Equation, Justification and Type fields for the new measurement system.
Measurement systems and units configuration.