Right, you would do it in Execute SQL Query, and I guess you could do this (to duplicate one row):
Code:
INSERT INTO rssfeed
(SELECT NULL, `title`, `url`, `port`, `ttl`, `maxresults`, `userid`, `forumid`, `prefixid`, `iconid`, `titletemplate`, `bodytemplate`, `searchwords`, `itemtype`, `threadactiondelay`, `endannouncement`, `options`, 0 FROM rssfeed WHERE rssfeedid = 1)
And you'd change the 1 in "rssfeedid = 1" (at the end0 to the feed id that you want to copy. (So I guess it's not really that advanced

). You may want to go to the Scheduled Task Manager first and temporarily disable the RSS Poster Robot task, or else it may run before you get a chance to go in and edit your new feeds.