When your account is moved over to the new system, your current categories will become campaigns. Therefore, the main thing you can do to best prepare your account for the upgrade is to review your categories to be sure you’re happy with the way you’ve organised your listings. The way you organise your listings into categories is entirely up to you and your business needs. Typically, advertisers create categories for: individual products or product lines; seasonal promotions; listings that need to be managed very closely; or listings with similar bids. You’ll also be able to make any changes you wish once your account is upgraded, to help you best organise your campaigns.