Overview
The assignment of customs code numbers for individual articles (the so-called "classification") is the core function of CTC.
Clicking on the field for the customs code number in the collapsed article view

or on the green button in the 'Classification' column in the expanded article view

opens the classification mask:

Here we know four ways in which we can assign a customs code number to an article. Further information on the individual classification types can be found in the corresponding sections: