I apologize if my question is in the wrong forum.
I was wondering if there is a way of auto generate sequence diagrams in Rhapsody 7.5.
I have ll the code in place, and I wanted to create some sequence diagrams for some classes. Is there a way of doing that?
Thanks in advance.

Yes there is.
You need to execute the model with animation and capture the animated sequence diagrams.
These can form the basis of regression tests.
1) a) Create an otherwise empty sequence diagram with the lifelines you are interested in (I think this is required). Or
b) Add instances manually to an animated SD during animation. Or
c) User Guide mentions Auto-creating Animated Instances
2) Build and Run
3) Tools - Animated Sequence Diagram - choose your sequence diagram (or just have it open when you start animation)
4) It gets automatically drawn