Copy a field from one item to another item using an item rule set

Summary:

Hi

I have reviewed the question( Item rule set for copying item EFF to another Item EFF — Cloud Customer Connect ),

but I have two questions about the item rule set :

① Is it also impossible to copy fields that are not EFF using an item rule set?
② Even if the target item is registered as a related item, is it still not possible to copy the fields?

Content (please ensure you mask any confidential information):

I want to use an item rule set to copy fields to another item that does not have an item rule set configured.

I understand from other questions（