Dependent custom field lis

[Manoj]

Hi Community, 

Kindly suggest. 

what i want to achieve is when I select HR Department in Pillar (custom field)  and then it only shows the sub-department in platform( custom field). 

This is what i believe is half way right but unable to define first portion of the script in ScriptRunner.......

if (Pillar == 'HR Department') {

 options = ['HR_Recruitment','HR-L&D','HR-Admin']

} else if (Pillar == 'Marketing') {

 options = [''Digital Marketing', 'Rural-Marketing','Urban-Marketing']