Hello, @tclark47988. I'm glad you've asked this question here.

I'll provide you with the information to ensure your invoice's time will be in a ratio format.

Yes, the ratio format is still available since this is the default format for entering time in QuickBooks Online (QBO). You can find this when you enter a time in the Single time activity or Weekly timesheet sections from the + New icon.

Feel free to use the screenshot below as a reference:

Then, this will show on the right side corner of the invoice form as Billable time and click the Add icon. You can see the sample screenshot below:

Once done adding, the time will show in the Qty (Quantity) column from the Product or Service section as a decimal point or whole number. You don't need to worry about it since it will return to ratio format once you send the invoice to your customer. A sample image is provided below:

Please know that you won't be able to use the Time feature for your invoices in a QBO Simple Start subscription since it's only available to Essentials, Plus, or Advanced.

To learn the details of each subscription, feel free to get it from this link: QuickBooks Online Plans and Pricing.

You can follow the steps below if you wish to upgrade your subscription:

1. Go to the Gear icon.
2. Select Subscriptions and billing from the Profile column.
3. In the subscription table, click on Upgrade your plan.
4. Then, follow on screen steps.

Check out this article for more information: Upgrade or downgrade your QuickBooks Online edition.

You might want to learn how to modify your sales form in QBO. Feel free to read this article: Customize invoices, estimates, and sales receipts in QuickBooks Online.

Don't hesitate to return here if you have additional questions about managing your invoice transactions. We'll help you as soon as possible. Take care, and have a good one.