If your business is growing, your Volusion store plan can grow with it. To upgrade your shopping cart plan, log in to my.volusion.com and click the Plans / Orders under my Account. Then click Upgrade My Plan.
From here, you can select any plan greater than your current one (or place on hold). Click Change My Plan to continue. The amount of time required to upgrade your account may vary depending on the size of your store. Once your store account has been upgraded, you will receive an email confirming your upgrade.
If you're upgrading to a semi-dedicated store plan, you will receive an email from Volusion regarding your account prior to the store upgrade.
Please note that if you want to downgrade your plan, you'll need to submit a ticket to Billing to verify that the number of products you have set up do not exceed your required plan's limit.
Information on the various plans can be found here: