Deleting a variable removes it from the Variables palette. If you delete a variable that is bound to an object, the object becomes static (unless the object is also bound to a variable of a different type).
To delete a variable:
Select a variable you want to delete.
Do one of the following:
Click the Trash button in the Variables palette, or choose Delete Variable from the Variables palette menu.
To delete the variable without confirmation, drag it to the Trash button.