Merging my private courses - How to?

Having been using LingQ for many years, I have accumulated quite a large number of private courses. I want to re-organise these courses. Is it possible to merge two or more courses and how can this be done?

You can’t merge course. You will need to move lessons from one course into other and then when you move all lessons you can simple remove an empty course.

Thanks Zoran. The method is slow, but it does work.