To edit any of the existing size scales, select Edit record from the Actions menu next to it, its details are displayed as shown in the below example:
You can update the size scale name and list of sizes, and you can also list the obsolete sizes or set the whole size scale as obsolete. Obsolete master size scales and sizes are not displayed in the dropdown lists. Editing the criteria can be done through the above window or selecting Edit criteria from the Actions menu as mentioned in Edit criteria - Master size scale. Update any of the displayed information then click Save.