Cascading select field (Type & Slot). Select one option in 'Type' & Select multiple values in 'Slots' under that Type.
I have a long list of values in Slot (for ex: 25 Slots for each Type), hence it would be difficult to apply Behaviour Script.
Any solution/workaround would be a great help. Thanks in advance.
A cascading select list only has one value, you can't give it multiple ones. The database structure doesn't support it, let alone the back-end code or UI.
There's nothing you can do with Behaviours or even Scriptrunner directly, you'd need to write an app that provides a new custom field type.
What you could try with Behaviours is two separate custom fields, a single select and a multi-select. I think (I have not tried this) Behaviours could change the available options for selection in the multi-select based on the current selection in the single-select field.
If I understood all of the above correctly then I'm happy to share that I was able to implement something like your requirement describes in former times using Tree CF (https://marketplace.atlassian.com/apps/1219011/tree-customfield?hosting=server&tab=overview).
In case you are interested you could have a closer look at it on Marketplace and probably test it on a non-production environment if it suits your needs.
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