Multiple node add for Drupal Commons

We are developing a Drupal Commons community site for a music school with private lessons. We've made a content type "Lesson" where the teacher can log whats been done, upload files, and let the student comment, ++ Every student has 15 lessons every semester (6 months. 30 total pr year) We have about 80 students = a total of 900 lessons pr year Every student will have their own Drupal user. We want to create a "Lesson" node for every lesson. Challenge 1: We need an effective way of creating those nodes, and avoid the manual node/add/lesson for each and every node. We want to prepopulate a date field on the nodes based on a list of dates. Usually 15 dates. We also want to prepopulate the student assosiated with the lesson. We are planning to have a separate Commons (OG) group to each student, so if we could have a multiselect choice of groups to create nodes for -that would be great. Example: We have 4 students(Nina, Frank, Carl, Lisa) with their own Commons group. They shall have 4 lessons this week. 1. We select the students groups in a multiselect field 2. We paste our dates in a multiline text field. Format: [login to view URL] 3. We click "Create nodes" 16 nodes are created automatically. We have done some testing with [login to view URL] and that solves some of the problems, except prepopulation with multiple values. There will be needs for filling in values in other fields also, like the body field. But only the two fields explained above need multiple/unique values.