Delete All SubItems

We have created 6 subitems (using an automation when a new item is created) on our Sales board. We no have 100’s of Sales items that we could like to delete the existing subitems for.

Can someone help to point to a simple way/query to delete these 600+ subitems (without doing it manually)? If it helps, the subitems are named the same thing in each Item (Hardware, Software, Professional Services etc…).

I’ve been searching the Community boards (and took a look at : Deleting subitems) however that is just an individual item. Any help with using the same API playground to delete from an Array/List would be great!