Show related nodes of a specific type when looking at a node of a different type I have a custom content type Topic, another custom content type Sub-Topic, and a taxonomy Topic Tags.  I'd like to be able to display the sub-topics on the page for each topic that has any of the same topic tags.

I'm using panels to define how pages look topics, and I was trying to use a view for the sub-topics.  I can make a view that filters by a specific tag, but I can't figure out how to pass the tags that the topic node has to the sub-topic view.

Thanks!
I would look into using the "context" module for this. 

With it you would be able to set "conditions" and "reactions". The condition, being if your topic node is visited, react by showing a view block of the sub-topics. You can configure said block view to show the taxonomy tags based on certain criteria.