I have created a number of categories, and would like to add the same large set of subcategories under each one (for example, states or countries). How can this be done quickly?

Under Change Settings, Backup Data, there is an option called Import Category Data From .csv Format File. This allows you to create a text file called a .csv file with a list of categories and subcategories you'd like to create, and import them into LinkMachine. You can use the option above that, Export Category Data To .csv Format File, to see the format that is required for this file.

This option is also useful for copying a full set of categories and subcategories from one LinkMachine installation to another.