Yes, you can add new Small Business plans to your Yahoo! account anytime. Consider registering variants of your domain name you can forward them all to your current web site. Or perhaps you already built a web site for your upcoming wedding, and now you'd like to create one for your business. No problem: Go ahead and sign up for another Web Hosting or Merchant Solutions plan. You'll be able to manage all services using the same Yahoo! ID.
To add a new plan anytime, visit the Small Business home page and choose the plan that's right for you. When you're asked to sign in, be sure to enter the Yahoo! ID and password associated with the account to which you want to add the new plan.
AT&T Yahoo! customers: To order a new plan, you'll need a Yahoo! ID. (Unfortunately, you can no longer use your AT&T Yahoo! ID to order a new plan.) Learn how to sign up.