Products we use: JIRA, GreenHopper, Structure.
We use the structure copy/clone process for feature templates. This gives us the ability to copy in a new template of issues for each new feature we are developing. Now we are looking to store test considerations for the test plan in Structure, in template format, to copy portions into each story within the features. The inclusions are obviously dependent on the feature itself.
Our product is quite mature and there is a large amount of considerations with a many to many relationship among them. For example, categories Car and ShoppingCart will both reference the test items for wheels, metal, steering device. Any advice on how to implement this with the most ease would be greatly appreciated.