Hmm. interesting. Basically you need to read a value from an entity and update another entity with that value. The problem you’re facing is entity related tags (for example {ENTITY DATA:X}) works with entities assigned to tickets but you need to read data from an entity that is not assigned to ticket.
You can load an entity with Load Entity action and pass that entity to an automation command to read values but this is pretty complex. With V5 we’ll have {ENTITY CUSTOMDATA BY NAME:X} tag to read custom data from entities that are unassigned to ticket.
PS: English is not my primary language too. Please ask if something is not clear. Also thank you very much for explaining the issue in that detail.