Hello, Mark. Welcome to FileMaker.
What you're seeing is an example of how there are different ways to organize the Relationships Graph. The template files (the ones I've looked at, at least) use a scheme known as "anchor-buoy". It's a somewhat non-traditional method for organizing the graph that focuses on the layout-centric nature of FileMaker and a predictable naming convention to impose a structure on the solution. It's fairly popular, but not the only way to organize the graph.
Ray Cologon wrote a good white paper a while ago about different graph organization methods. I've attached it for your reference. Hope it helps.
Hi Mike thanks for your reply..OK anchor_buoy..that makes sence now that you say it. I have printed off the attachment so thanks.