Hi there, Mark Schulte.
I'm here to provide some additional clarification on your question regarding adding customers to expense transactions.
Entering billable expenses is currently available in the Plus version of QuickBooks Online. Since you've mentioned that you're able to do it before, I recommend contacting our Phone Support Specialists.
One of them will be able to pull up your account and review the list of subscriptions. They also have the tools to assist you further with adding a customer on an expense.
For the information on how you can reach them, please see this article: Get help with QuickBooks Online.
Please let me know if there's anything else I can do for you. The Community is here to help.
