Using Mind Maps links, you can easily share your maps with others, even specific branches.
To Share a Map Link:
Open up a Mind Map.
Go to the Map settings by selecting the 3 dot menu in the top right-hand corner.
Then chose "Copy Mind Map link" from the drop-down link. A web-link for that map will be added to your clipboard. You could then paste that link through a messenger service, email, or even onto the branch of a different mind map.
Copy Branch Links:
Tap on a branch and open the menu by tapping on the 3 dots.
Tap "Copy" to copy the branch to your clipboard. You can now paste that link to share it.