Hi there, @all-about-homes-.
The option to group billable expenses on invoices is unavailable in QuickBooks Online (QBO). However, you can create a subtotal for billable items on your invoices as a workaround. This will group them, and then you can enter the remaining items on the next line. Please refer to the screenshot below for visual guidance.
I understand the significance of having this feature for businesses, especially when recording sales transactions in the program. I will make a note of this as a suggestion to enhance your experience in QuickBooks.
Furthermore, you have the personalize and add specific info to your sales forms to improve your business communications. This allows you to control what information your customers see and include only the most relevant details for your business.
If you have any additional questions about managing billable expenses in the program, feel free to ask in this thread. I'm here to provide further assistance. Have a wonderful day!