Hello there, @Orange Cat.

Currently, the option to share the vendor's database to multiple entities in QuickBooks Desktop (QBDT) isn't available. You need to manually add the information per entity. With this, you can export your vendor list to an IIF file from one entity and import it to the other.

To export, here's how:

1. Go to the File menu.
2. Select Utilities.
3. Choose the Export option, then select Lists to IIF Files.
4. Select the Vendor List box and click OK.
5. Browse the location where you want to save your file and click Save.

I've attached a screenshot below that shows the first four steps.

Once done, open the other entity and make sure to log in as the Administrator and in a single user-mode to import the vendor file. Before doing so, you'll have to back up your company file for future use. When you're ready to import, here's how:

1. Go to the File menu
2. Select Utilities.
3. Choose Import and click IIF Files.
4. Follow the on-screen instructions to complete the process.

I've attached a screenshot below that shows the first three steps.

After that, I'd recommend pulling up the Vendor Contact List report. This is to make sure the process above is successfully executed. Just go to the Reports menu, select the Vendors & Payables option.

Additionally, in case you want to export and import vendor list using the MS Excel file, you can refer to this article: Import or export MS Excel files.

Don't hesitate to leave a comment below if you have other concerns with managing your vendor database in QBDT. I'd be happy to help. Take care always.