How to automatically remove labels from child issues?

[Etai Leers]

I got a "Theme" custom issue type.
The "Theme" is above the epics level.
I got a automation rule that every new label in the theme issue type it automatically add it to the hierarchy below.
(e.g. to all the Epics and their child Tasks/Stories/Bugs).

I'm not sure how to create the opposite way, when a certain label removed from the "Theme" I would like to remove the exact label from all the hierarchy below. 

[Evgenii · Accepted solution]

Hi, @Etai Leers 

If labels in your child issues are always same, as in Theme issue, maybe it's better not to remove labels from child issues, but to clone set of labels from Theme issue to child issues?

[Evgenii]

When you copy labels from Theme issue to child issues - they will replace current labels.

[Etai Leers]

There is no option to fetch only the change?

[Evgenii]

Sorry, don't think it's possible with Automation. In changelog is seen list of labels, there is no information, what exactly label was removed, you can understand it only by comparing two lists (new and old).

Here is rule, that makes similar task:

It's parent task changelog:

It's child issue changelog:

[Etai Leers]

Ok thanks. 

[Etai Leers]

Thanks, @Evgenii but I need to remove only the specific label that been removed from the Theme.

For example I got a Theme with the following labels: "Label_01" , "Label_02" , "Label_03".

Now, someone removes the label: "Label_02" from the Theme.
I would like the child Epics and other issues to contain only: "Label_01 , "Label_03".

It works for me for adding new labels.
But when a label removed I need to remove the specific label from the Epics as well.