Parent-Child - Getting service item fields from parent SR into child SRs

We have a few Service Item bundles that collect a lot of data, and the additional items are separate child tickets that track work related to processing/validating the parent ticket.  We would very much like to copy all visible fields from the Service Item in the parent as a note to all the children.  I initially thought that I could use an Expression in an automator that processes the parent ticket to use the trim function to store data from the all visible fields placeholder, which I would then place into a subsequent action as a note to associated child tickets.  However, when I test it out, in the Activities I see that the expression step fails.  Any ideas how I can achieve this?  The form has a LOT of fields and conditions so as it is on the parent ticket I add a note of just the visible fields because it’s much easier for the agents to read than the reading the Service Item.