Looking for behaviour code example to show/hide values in a dropdown based on another field

[Denise Wermager]

I am looking for anyone that may have code example of a behaviour for JIRA cloud that shows/hides values in a multi-select field based on the selection of a specific option in another multi-select field.   

• I have two fields: A & B
• Both are of type multiselect
• Field A has options x,y,z
• Field B has options 1,2,3,4,5
• If user selects x in Field A, Field B should provide options 3,4,5
• If user selects y or z in Field A, Field B should have all options 1,2,3,4,5

We do have the Scriptrunner plugin and we are working on migration from DC to cloud. I need to replicate a behaviour I have in DC in the cloud.