as in saved through advanced duplicator? there's a folder manager button on the menu, or you can go into the actual dupe files with explorer. (can't remember the directory, I'll check once I've done my homework).
or if it's saved games, delete them from your saved games folder at garrysmod/garrysmod.
E: adv dupes are saved at garrysmod/garrysmod/data/adv_duplicator as .txt's
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