WordDock maintains the WD docks. My docks holds your own - anything you import under a name of your own. Each dock keeps its own progress; bold means you've made progress there. Lists are yours to slice and annotate, WD lists included; only a dock is fixed.
One rule for your own lists: within a dock, every entry needs its own ID - never restart numbering in a new file. Progress is tracked per ID, so two files that both start at 0001 would share scores between different words. WordDock checks this when you import and warns you.