I'll share the details about merging customers in QuickBooks Desktop (QBDT) Enterprise, @Lisa-S.
Yes, you're right. Quotes aren't included in the merge from the duplicate customer to the correct one. It will only cover their other transactions and history. You'll first have to create a backup of your company file before merging your 11 separate customers under one bill to account. It's because this process is permanent.
As a workaround, I'd suggest manually entering the quotes in the program. Just use the correct customer you'll keep after the merging process.
I recommend running any customer, job, and sales reports in QBDT Enterprise. These will help you keep track of your sales and expenses. You can also click Customize Report to get the details you need about your business. For more information, visit this article: Customizing Customer, Job, And Sales Reports.
I'll lend a helping hand if you need further assistance. Keep safe always, @Lisa-S.
Best regards,
Raymond Jay
