I sent this to support and was told that Aha doesn't support it. I'm in the market for a PM tool for our company, but it needs to be able to import the (almost ) 1000 feature requests that we keep in Redmine, and the thousands of tickets that we keep in Mantis.
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This can be achieved by importing redmine issues to Aha! via CSV. You can do this by going to Settings -> Product -> Import from CSV.