You need an identifier to save both the customer and vendor, Ashley.
Yes, a contact can be a vendor and customer in QuickBooks Online (QBO). You may use a distinct character on the Display name since the system won't accept identical names for a customer, vendor, or employee.
Example:
- Customer: Joesem
- Vendor: JoesemM
I have included screenshots to help you.




For more information on managing customer and vendor details, check these articles:
You can also utilize QuickBooks Live Bookkeeping to improve your accounting practices. This service streamlines your bookkeeping process and saves you time. This allows you to focus on running your business and other activities that help it grow.
I’ll also share this article that shows you how to create and print a customer or vendor list report: Print a customer or vendor register.
If you have any other questions about customers, vendors, or anything else related to QuickBooks, feel free to ask. I’m here to help.