Hi N,
There is no limit to the number of image folders you can create within your Auctiva account, so feel free to create as many as you need. There shouldn't be any time lag between when you move a group of images to a specific folder and when they show up in that folder, so I suspect you couldn't find the images you moved from your Imported Images folder to your new folder because your "Manage Images" page was still configured to display images in your Imported Items folder or something of that nature.
In order to move images from one folder to another, you just need to check the boxes next to the images you'd like to move, select the desired folder from the "Move to Folder" 'pull-down menu, and click the adjacent "Move" button. You can also view the images in a particular folder at any time by selecting that folder from the "Show Images In" pull-down menu at the top of your "Manage Images" page.
Any additional questions or concerns? Please contact our customer support department using the appropriate link on our help page: http://www.auctiva.com/free-auction-software-help/help.aspx
-Mike