At this time the document sharing or other content upload tools in MyEconLab New Design courses do not filter down to member courses. This is something we are working to change.
In the meantime, a couple of suggestions. If you can upload all the material or as much as you can before the semester starts and then copy the course, that will save you time.
Since it is too late for the first suggestion, you might want to look at a free product like Dropbox. http://www.dropbox.com This will let you upload all your material to it and then you could share that material with your students.