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The numbers are very important because the reference has to happen outside of the editing tool / structure. I need to be able to identify that lesson 'xyz' is

• daveFNbuck 8y ago
  When you compile the document, the numbering is automatically added just like it would be if you had a single large document. The importing gives you the same final result as having a single file, but gives you the flexibility to put individual lessons in separate files for easier editing and reuse in other course plans. This also makes it easier to do things like print out individual lessons if you need a hard copy but don't want the entire document.