How to run multiple sessions of the same 9-week course concurrently?

Hi- is it possible to run multiple sessions or groups of the same course concurrently? In other words, let's say our "Introductory Sample Course 101" is 9 units long, each unit drip-fed 1 week after previous. I'd like to offer the course to begin anew with Unit 1 every 4 weeks, but keep students in each offering separate from those starting on different dates. Thus I might have the following:

• "Introductory Course 101" session A begins March 1, 40 students sign up.
• "Introductory Course 101" session B begins April 1, with 70 new students signing up
• "Introductory Course 101" session C begins May 1 with 55 new students
• etc.

I'd like each course to run the full 9 units, each drip-fed every 7 days after previous, but the students from each session not connected or involved or interacting with the other sessions. While Session A students are doing Unit 4, Session B students are doing Unit 1, with no confusion or mixup or crossover. How to set this up? Thanks :)