QuickBooks Online (QBO) is designed to manage one company per subscription. Nonetheless, we can adjust your company settings to accommodate invoicing for different business activities as a workaround, Car. Let me provide you with more details.
Before we dive in, it's important to recognize that managing transactions for two businesses within a single company account can complicate your financial reporting and tax obligations.
If your immediate need is to send an invoice for your website work, here’s how you can modify the company settings to reflect this:
- Go to the Gear icon and select Account and settings.
- Choose the Company tab and edit the Company name by clicking the Pencil icon.
- Once you've made the necessary changes, click Save and then Done.
- Please make a note of the changes to prevent any confusion in the future.

For more comprehensive guidance, please check out this article: Change your company name, contact info, or Business Number (BN) in QuickBooks Online.
Additionally, you can send statements to show customers summaries of their invoices, payments, credits, and balances.
Please return to this thread if you have other questions about the process, Car. We're here to answer them the best we can.