Yes. Here is an answer from Alvarez, Intuit Employee:
Yes, you can have more than one QuickBooks Online company (account) with the same email address.
This is the information for signing up for an additional company:
You can have multiple company subscriptions in Quickbooks Online and have as many QuickBooks Online companies as you’d like. Each […]
Resolution for 'additional company issue: 'how to have two companies on one sign in' available: Yes.
The additional company issue or error code is a known issue in Quickbooks Online (QBO) and/or Quickbooks. Support for this issue is available either by self-service or paid support options. Experts are available to resolve your Quickbooks issue to ensure minimal downtime and continue running your business. First try to resolve the additional company issue yourself by looking for a resolution described in the article. If it is a complex additional company issue or you are unable to solve the issue, you may contact us by clicking here or by using other additional company support options.
For more information about resolving issues related to additional company in Quickbooks/QBO or to get support for the issue 'how to have two companies on one sign in', click the link below: