Elements : option to mass delete unused tags
Lets suppose you want to create a sub-catalog from your main one. Simply do a backup and restore to a new location. Delete the unwanted picture files in the new catalog. Now, what about your keyword panel ? You may have more than half of the keywords that are irrelevant. I think there is an option in Lightroom to purge the keyword panel from unused tags. Could it be implemented in the next PSE version ?