Which Vendor detail fields map to checks? Company name, Display name, name to print on checks, contact firstname lastname? I have duplicate names in the mailing address.

The Vendor page allows you to update duplicate names in mailing addresses, Mmcallister. Let me help you navigate to this panel.

In QuickBooks Online (QBO), the vendor page is a central hub for all vendor-related information and allows you to update vendor details. Follow these steps to access this information:

1. Go into your QBO account.
2. At the left panel, select Expenses and choose Vendors.
   
   
   
   
3. Look for the Vendor with the duplicate names on the mailing address and click it.
4. Tap on the Edit tab in the upper right corner.
5. A pop-up window will appear in the right corner. This will display all your vendor's information and configure the details.
6. Once done, click Save.
   
   
   

After this process, I recommend creating a check and previewing it before printing it. Further information can be found in this article: Edit, delete, and restore list elements in QuickBooks Online.

Moreover, I'll also leave material discussing a feature that assigns preferred vendors to inventory items for quicker reordering and purchase order creation: How to add a preferred vendor and create a purchase order using that preferred vendor in QuickBooks ....

The comment section is always open if you have additional questions about your QBO vendor details. I'm here to help you anytime.