C-line question

Sometimes I have thoughts about things that aren’t relevant to my immediate situation. For instance, this morning I woke up thinking about a conflict I had with my best friend over a year ago. I did a thought download and am working on some models based on the thought download.

Is the C-line the original conflict? Or do I need to try to figure out the circumstance of what prompted these thoughts when I woke up?

And what if some of the thoughts have to do with circumstances over time? For instance, I have a thought that “she is selfish” because of several different things she did over the course of time. How do I pinpoint my C?