Hello, 

In the Action node you have a dropdown field where you can select to run that action in all child tickets. 

Thanks Daniel.  I’ve seen this option, but I can’t see what I need to add to get it to set the categories that same.  If I select “set category”, then I seem to have to select a particular category.  Is there something I can add to say set it to the same category as the parent incident?

You are right it’s hard set. You can’t select a placeholder. 

API, but then you can only change one child ticket. 

I guess a new app or requesting adding it to the parent/child sync app. 

@lisa.price 

For the notes and automatic closing i used the Parent-Child Synchronization app in there store, im still working on how to copy categories using custom objects, but the app might help you foreward a bit already.

Hello looked at it a bit more. 

You need do something like this on all tickets. 
As you can’t trigger on explicit child tickets. 

1)Web request node (W1) - Get ticket 
2)Parse  node W1
3)Condition  node Expression {{p1.root.ticket.related_tickets.parent_id}} != “” → YES
( If the ticket do not have a parent ticket nothing happens )

4)Web request(W2)  GET parent ticket {{p1.root.ticket.related_tickets.parent_id}}
(Get the data from the parent ticket )

5) Parse W2
6) Web request PUT ticket {{ticket.id}}
(Update the current ticket)

JSON:
{

        "category": “{{p2.root.ticket.category}},

        "sub_category": {{p2.root.ticket.sub_category}},

        "item_category": {{p2.root.ticket.item_category}}

}

You may need to add extra expression nodes before the last put. 
Placeholders that are empty do not return null so you need to something like this 

if “{{p2.root.ticket.category}}” == “”,”null”,”{{p2.root.ticket.category}}”
if “{{p2.root.ticket.sub_category}}” == “”,”null”,”{{p2.root.ticket.sub_category}}”
if “{{p2.root.ticket.item_category}}” == “”,”null”,”{{p2.root.ticket.item_category}}”

{

        "category": “{{E1.result}},

        "sub_category": {{E2.result}},

        "item_category": {{E3.result}}

}