First you should prepare a file including definitions for the new exercises. The file does not have to (though it can, still it is not recommended) include definitions of the already existing exercises. While importing (in the browser window) you should choose this file and name the course with the name of the course that has to be enlarged.

A new set of exercises will be added to the course. The learning process data for the existing exercises will not be lost. With this mechanism it is possible to add a few new exercises easily and quickly, even to a course with a large number of pages without losing the learning process data.