We've asked Ashley about this just a few days ago:
https://www.construct.net/en/forum/construct-3/how-do-i-8/create-hierarchy-tilemap-in-168930
Thanks, dop. Believe me I've searched in google before posting, I dont know how I missed that post 🤔
Anyway, It may be worth it to chime in with my two cents if ashley is already following that post