Need to create a button in Lectora file to launch another course.

[Angela Marshall]

Hello everyone,
I'm looking for Lectora/Coursemill/Web experts to help me create a button that will launch another couse, inside of a course. Here's the need to know background:

-My Lectora course has 5 different AU's: 4 subsections and a completion status. I set them up with seperate AU's so that the users can complete the 4 subsections at different times, but they are in the same course so that I can share the same completion variables.
-This will be published out to coursemill.
-Each subsection will have navigation button to launch the shared completion status "course".

So, I have my button created and its in Lectora. But, I can't tell it to go to the page inside the other AU. I want to add some code or html link that will launch each users' own completion status AU. There is a button inside of coursemill for this, but I dont want to be extra user-friendly by adding them an option inside of the course.

This makes much more sense with the pictures I have, so see attachments. Picture 1 is the sections and completion status in Lectora. Picture 2 is how the whole file publishes into Coursemill (the code on their completion status button is ultimately what I think I'm looking for). And Picture 3 is the button I created for the course that I'm hoping can launch the completion status AU.

Thanks in advance,
Angie