I recognize the importance of resolving this matter, Kate111. Let me share a summary of setting up the serial number tracking in QuickBooks Enterprise.

QuickBooks Desktop Enterprise comes with a built-in serial number tracking feature, which requires enabling Advanced Inventory to ensure system synchronization.

To Turn on Advanced Inventory, please follow the instructions below:

1. Go to the Edit menu and select Preferences.
2. On the left pane, choose Items & Inventory, then go to the Company Preferences tab.
3. Check the Inventory and Purchase Orders are Active box.
4. Click the Advanced Inventory Settings button, then select the Serial/Lot Numbers tab.
5. Check the Activate serial or lot numbers box, then tick the Serial Numbers radio button.

If the Advanced Inventory Settings button appears grayed out, we can synchronize license data online to ensure QuickBooks recognizes it. Follow these steps to take care of this seamlessly. Here's how:

1. In QuickBooks, go to the Help tab.
2. Click Manage my License.
3. Select Sync License Data Online.
4. Check if the Advanced Inventory Settings button is no longer in a grayed-out state.
5. Close and re-open the QuickBooks program.

Once done, you can now assign a serial number to your inventory. For a comprehensive understanding of the process, I recommend referring to this article: Use Serial or Lot Numbers and Expiration Date.

Furthermore, you may refer to this article for additional details on how to track inventory stored at different sites or locations: Set up Advanced Inventory.

If you have further questions regarding other advance inventory-related concerns in QuickBooks Enterprise, please feel free to reach out. I'm here to help. Have a productive day!