How to get subtasks to show up on board

[Lucid Software]

In Work mode, on my board, my subtasks are hidden.

My filter looks like this: Component = Foo.

The subtasks don't have the Foo component

So what do I do....adjust the filter to query on parent values (doesn't seem possible)...add Foo to subtask and keep its value always in sync (doesn't seem possible)...add a custom field (doesn't seem to help) something else?

Having boards as filters is a nice idea, but it doesn't really work for even really simple stuff, like A= B.

[Ollie Guan]

Board Filter Query

(issuetype in (story,task) and component = Foo) or (issuetype = Sub-task)?

[Lucid Software]

That doesn't work, because I see subtasks on the sprint board regardless of the parent component value.

[Ollie Guan]

issueFunction IN subtasksOf("component = Foo")