What is the syntax for migration when specifying folders

What is the syntax for migration when specifying folders

I am trying to migrate the drafts folder and its subfolders. When adding an account, under Folder Option I chose Folder Specific and entered INBOX.Drafts. It migrated only the top level emails, and ignored the subfolders.
When I tried to specify the subfolders, it froze with the message: "Adding members..."
I was using the following syntax:

INBOX.Drafts.Folder1,INBOX.Drafts.Folder1.SubFolder1, INBOX.Drafts.Folder1.SubFolder2,INBOX.Drafts.Folder2,INBOX.Drafts.Folder3

What syntax should I be using?