Multiselect custom field filtering by value from another multiselect custom field

[Amar Ghag]

Hi Community,

I'm looking for groovy script for scriptrunner to allow filtering of multiselect custom field B based on multiselect custom field A values.

I've tried Cascading selects and they don't work for me due to the multi select need as output.

Custom field B will filter based on the multiselection of A and allow a selection of multiple values.

1. Field A (Multiselect) :  
   • 1
     • Apple
     • Orange
   • 2
     • Pineapple
     • Grapes
   • 3
     • Banana
   • 4
     • (Blank)
2. Field B (Apple, Orange,Pineapple ,Grapes,Banana)

Case 1:

If users select 1 & 3 from field A then field B should display Apple, Orange,Banana as multiselect list.

Case 2:

If users select 1 &  from field A then field B should display Apple, Orange,Pineapple,Grapes as multiselect list.

Case 3 :

If users select 4 &  from field A then field B should display as none.

Can anyone suggest a script to achieve this ?

Thanks,

Amar