Expose ability to create custom rules for the rules engine in the UI about opencti

[nino-filigran]

@akshaysth thanks for your request. We do not plan to make rules engine editable on the UI because of the impact it can have on the platform if they are wrongly setup.
However, what we would like to do, to achieve your use case is to do it through automation. Within the task "manipulate knowledge", to add an option "inherit from parent task" (or something like this) in order to be able to propagate not only labels but additional fields too. We'll update the ticket once done.