How to use the landscape sculpting tools on multiple landscapes?

I created some Landscapes using WorldMechine and all I want is to use the UE4’s landscape sculpting tools
to connect the landscapes and make the connection look more natural.

Unfortunately I cannot use the sculpting tools on the landscapes at the same time…
I tried using world composition but with world composition I can’t Import the landscapes from WM.

So how can I use the landscape tools on both of the landscapes???

Try putting the landscapes into a sub directory THEN enable world composition at this point it searches the sub directory and will line them up if you have named them correctly - I believe WorldMachine has a feature for exporting in this way.