As a rule, preset groups of units of measurement are enough for work with StoreHouse. But, if neeeded, new UOM groups can be created. To create a new UOM group:
Call the context menu in the left part of the Units of measurement window
Select Create UOM group or use the Document >Create UOM groupmain menu item
A window will open on the screen
Enter the name of the new group in the Name line of the Group of measurement units window
Use the Document > Save document main menu item or click the button on the toolbar.