You can define the attributes that you want to assign to a channel. You just need to go to the Data - Channels section, click on the channel you want to configure and click on the "Diffusion" tab.

Here you will find two parts. The lower part allows you to select a document type :

A list of the document type attributes appears. Drag and drop the attributes that you want to use in your channel, from the left square (in orange below) to the right square (in green below) :

Finally, click on the save button.

Keywords : channel, attribute, broadcast.