Auto pick custom fields based on 1 field (dependent custom field) scriptrunner

[M]

 Hi All,

I have few custom fields which i want to automate, if i fill the inputs in one custom field then based on first first field, rest few fields get autofill.

for example- am running an hr project and in which i have specific role, standard role and broader role 

so specific role- backend developer, standard role - developer, broader role - development.

How would i start putting in script runner/behavior ? could you pls suggest.

So far i have learnt is below :

import com.atlassian.jira.component.ComponentAccessor

def cfSpecific Role = getFieldById("customfield_122321")
def cfStandardized role = getFieldById("customfield_23601")
def cfBroader Category = getFieldById("customfield_24652")
def cfNext Level Category = getFieldById("customfield_24254")

[M]

@Ram Kumar Aravindakshan _Adaptavist 

Hello, could you pls guide.