Thanks for reaching out to the Community, suzie12. I appreciate your detailed information.
I can certainly understand how an ability to merge projects into customer profiles could be useful and have submitted a suggestion about it as of today.
You can also submit your own feature requests while signed in.
Here's how:
- Use the Gear icon, then go to Feedback.
- Enter your suggestion(s) in the Have feedback? window.
- If necessary, attach a file with your Camera icon.
- Select Next.
Your feedback's definitely valuable to Intuit. It will be reviewed by our Product Development team and considered in future updates. You can stay up-to-date with the latest news about your product by reviewing Intuit's Product Updates webpage.
As a workaround, you can edit each transaction under your project and re-assign them to the appropriate customer. After doing so, you can delete your project.
I've also included a detailed resource about working with projects which may come in handy moving forward: Create and manage projects
Please feel welcome to send a reply if there's any additional questions. Have a lovely Tuesday!