Only place biome on selected textures

[Marekie]

Hi, 

What would the process be for putting a biome only on a selected texture? 

 

My goal would be creating severals biomes and put them on areas on the map where i painted texture X. 

 

Thanks in advance!

[Bryan]

Yes that would be the masks inside the biome. 
You can add it to a direct spawner or the biome itself. 
You would just need to add the mask to either one.