Exclude a part of a place

General
1

I do many identifications in South East Asia. For the place, I use
place_id=6967,7002,6847,90097,6966,6992,7001,7838
Now I want to exclude Malaysia’s west coast from that area.
How can I achieve that?

2

If a place exists for the region you want to exclude, you can use not_in_place=ID in the URL.