Automation off creation of sub item

I would like to have an automation similar to the one that works off items ‘when item is created in board 1 then create item in board 2 and connect items via…’ but for sub-items.
Does anyone know if this can be done without any external apps?

Hi @Jessie_Plumpton - sadly that specifically is not supported (on subitem creation). It does work for status and other column changes, just not on creation.