Go to the
QuickBooks Online pricing page and choose the plan you need. When it asks you to create an account, don't fill in the new user details. Look for the sign-in link instead.
Once you sign in with your current email and password, QuickBooks will link the new company to your existing account. This way, you won't have to manage two separate logins.
Since each company needs its own paid subscription, you'll have to go through the checkout the new one. Once done, you can jump between them by clicking the
gear icon and selecting the
switch company option.
Keep in mind that since this is a fresh start, you need to enable
VAT settings and link the
bank accounts for this specific business. QuickBooks treats it as a blank slate, so your tax reporting stays completely separate from your other company.
Let me know if you need anything else. I'm here to help.