How to build a large terrain in a team?

I am newbie for world machine. We want to build a large seamless terrain for a whole game. And we has a team to design different part of this world.
I find the tiled input and output in document but I am still investgate by using the basic version. I am not sure whether the tiled feature can help this. But what I see is the tiled input can only input a height map but not another tmd file.
I think the best way is desgin the large landscope of the whole world, and different person focus in different part. For example alice build the hill, and tom build the lake. One task may cross just one block.

Is there any way we can edit the world and merge them togather. Is there any best parctice for this?
Thank you~