Hello, @Laura1969. I'll lend a hand to achieving your goal so you can manage your business seamlessly.

If you're currently using QuickBooks Online, it allows multiple users to work simultaneously at the same time with different workstations. That said, the system lets you add information on the second computer. Thus, it will show up on the first computer you've used.

You can check out this article to know more about the types of users you can add and what they can do in QuickBooks: User types and user permissions in QuickBooks.

Otherwise, it depends on the setup if you've installed and set up the QuickBooks Desktop. From there, computers on your network can access your company files.

Here's a guide you can read through to learn more about this setup: Install QuickBooks Desktop on a server.

Additionally, his resource helps you install your workstations in the future: Install QuickBooks Desktop.

Fill me in if you have more queries about doing your QBO or QBDT-related tasks. I'd be glad to assist you further. Take care always and best regards.