We have tried to add a category in the database using "modify table view," and add a new category, but the closest category VW displays is "unique ID." There seems to be no way to ass plant ID as a category and make it import to a plants symbol, as you can do with name, size, etc.
We tried to have this question answered in a previous thread and while there were quite a few views (98), only one response was given which proved fruitless.
http://techboard.vectorworks.net/ubbthreads.php?ubb=showflat&Number=181655#Post181655