For the Entrepreneur Plan and higher you are able to manage multiple solo.to pages under the same account.
To add additional pages go to the Account page of your dashboard and scroll to the Pages section. Enter the new username into the username field, then click Create Page. Your page will be created instantly if you haven't reached the limit for your current plan.
To switch to editing your new page, click on the page under the Switch To label in the Pages section as shown below. This will be your new active page in the editor until you switch it again.