Hi Alton,
Thanks for posting your question here. The "Post" button on the listing creation page actually does save the listing as well as post it to eBay. If you create a new listing through Auctiva and send it to eBay using the "Post" button, the listing details will still be retained automatically on your Saved Listings page.
I hope this helps. If you need any further assistance with your account, please feel free to contact our customer support team by mousing over the "Help" tab within your account and selecting the "File Support Case" option.
-Mike