Importing into Topicscape
Topicscape can import from folders and files, specific types of text files describing structure, and files (mainly XML) produced by other products.
When importing folders and files to add to the already-open Topicscape, you drag the top folder into Topicscape and drop it on the appropriate topic. All other import actions are done from a menu: Either the File menu, Import item or the context menu that appears when you right-click on a topic.
As described in Exporting from Topicscape there are several 'round-trip' options that support the re-importing of data originally exported from Topicscape.