Hi tomchen,
There is no specific functionality within Auctiva designed to allow users to transfer listings from one account to another so, to accomplish this, you will basically have to re-create your listings in the second account.
One suggestion I would like to offer that may save you some time during this process is that you can open one account in one browser and the second account in another browser, and then paste the information from the lister page in one account to the other.
-Mike