How can i create a alias to enblsnpiso command?

Dears,

 

In AutoCAD, there is the ISODRAFT command and in DraftSight the similar command is enblsnpiso. But this name is not so familiar and i'd like to create an alias called ISODRAFT also. But when i try to do it, i get a message: Unknow variable name. How can i create a this alias correctly?

Could anyone help me?