Cascading custom field - set value

[Dan27]

Hello,

I have a custom field, cascading type, with 4 levels.

I want to set value in this field, using the last level value (script runner, issue updated event).

example :

I have the value x,

I will choose this option in the cascading field: (j,y,z,x)

Can anyone help me with it please? I didn't work with this type of custom field yet..

Thanks,

Daniel