When a UDA definition is copied, a new key (a reference number known only to the system) is assigned to the new element. Occasionally you may want to have more than one definition with the same key; for example, to vary the default or UDA length depending on the element types. To do this the key may be copied using the command:

Where two or more definitions exist with the same key, the definitions must have the same name, minimum abbreviation and type, and different ELELISTS, otherwise an error will occur on compilation. It is advisable to have the same units and RPTX text. Note that project reconfiguration will always copy the key.