Larian Studios Forums Divinity: Original Sin 2 - The Modding Dungeon Divinity - Original Sin 2 - Modding General MOD: Additional monsters for GM mode

Nevermind! I figured it out. Thanks again for your previous post. It helped.
You need to find the asset in the Root Template folder, not the resource manager.
Right-Click -> Create new from copy allows you to make custom creatures.