Show/hide custom field options based on other custom field options

[Maruthi Prasad Syave]

I have two custom fields both are select list,
one is multi select list and another is single select list.

Multi select list field options are "A" and "B".
Single select list field options are "1","2","3","4","5","6".

Now my requirement is in multi select field if i select "A" i want these option from single select "1","2","3" have to visible to select.
same for 
in multi select field if i select "B" i want these option from single select "4","5","6" have to visible to select.

if i select both "A" and "B" i want all 6 options have to visible 

for your reference i attached screen shot below 

How can i achieve this using script runner behaviours?