Populate a dropdown field based off the value of another dropdown field

[Leon Stewart]

We're creating a dropdown menu for one field based off the value of another dropdown menu field.  For example if field_1 = x, field_2 = 1,2,or 3   if field_1 = y, field_2 = 4,5, or 6.  We're currently using the Behaviors function of the Scriptrunner plugin to accomplish this.  However, we use a template to create a new issue, and field_2 is in the scope, field_2 is over written with the appropriate values base on field_1's value.  Can anyone suggest a different option to accomplish our goal?