@bobkc @grow your company You both asked for my workaround. (Sorry to be so late in responding!)

It's not complicated, though it is extra work. Product/Services simply do not work for billable expenses, as you've experienced, and as I've described in exquisite detail before. And for all the digital ink spilled in this thread by Intuit employees, they've not even addressed the problem, let alone solved it. I would have liked to have use them for the information they would provide in Name, Type and Sales Description fields. But since I can't use Product/Services for billable expenses, those data fields aren't available for invoicing.

So I do use the billable expenses and add them to the invoice, which is fairly straightforward and as I think was described most recently by @RenjolynC .

The trick to the workaround is what you have to do before creating the billable expenses. The only data fields from the billable expenses that QBO will make available for the invoices are Date, Description, and Amount, along with any attachment. So any information you want your client to see on the invoice to understand the billed expense line item all has to be jammed into the Description field.

For us, traveling to clients' sites to provide consulting services, this usually means adding all the information detailing the travel-related expenses. So the values in the Description field often have to duplicate values in other data fields. So our billable expense Description values are expansive narratives like "Alaska Airlines airfare SEA-JFK 5/4/2022 for team training" or "Restaurant dinner 5/9/2022 following team training," etc. (And because QBO doesn't regularly provide both Description and Memo values in various reports and screens, we have to duplicate whatever is in the Description in the Memo, too.)

Sorry it's not an elegant solution, but it works. It's what we have to do because Product/Services don't work for billable expenses.