We've got some information to share about changing the item number assigned by the Fixed Asset Manager (FAM) in QuickBooks Desktop, InControl_1.

The option to update or edit it is unavailable in QuickBooks Desktop. We see consumer feedback as an opportunity to improve the numerous features of our products. We recommend giving our engineers direct feedback so they may look into this suggestion and incorporate it into future updates. Here's how:

1. Go to the Help option.
2. Click the Send Feedback Online option.
3. Choose the Product Suggestion option and a pop-up window displays.
4. Enter your feedback suggestion.
5. Press the Send Feedback button and the feedback is sent.

Alternatively, we can assign a FAM number to a fixed asset item by syncing FAM and QuickBooks Desktop. Here's how:

1. In QuickBooks, create a new fixed asset item.
2. In FAM, select the new fixed asset and go to Assets. The new asset number will be displayed in Asset number.
3. Close FAM to sync it with QuickBooks Desktop.
4. From the Lists menu in QuickBooks, select Fixed Asset Item List. Then, the new item should show the numbers under the FAM number column.

To learn more about this one, check out this article: Fix issues in Fixed Asset Manager (FAM). 

Moreover, you can refer to this article to learn more about tracking your fixed assets: Use Fixed Asset Manager in QuickBooks Desktop.

The Community will always have your back if you need help managing your fixed assets or any QuickBooks-related concerns. You have a good one.