Transport/Location/Transport location are words for defining how to exchange data with your partner. There are several ways to do this. However SFTP, FTP and AS2 are the most used ones.
In Link you find the transport type Testbox which can be used during the testing phase if you are not ready to send anything to your partner. It’s an internal folder only for testing.
You should clarify the channels for receiving and for sending documents with your partner.
The transport is set up different places in Link depending of the type of transport - or if the transport is to or from Link. Where to set it up is described in the subsections to this one.