The field is still there, but it's not on the page by default. You can go to the Sandbox environment, navigate to the Item Tracking Code page, click Settings (the gear icon near the top right of the Business Central window), click on Designer, and then click on +Field. Here, you will see the Lot Warehouse Tracking and other fields to add to the page.
Remember, once you add the field and close the Designer mode by clicking Stop Designing, you will have an option to save this change as an extension and download the code. If you want this change in your production environment, be sure to download it. This will give you a zip file. To upload this as an extension in your production environment, you will need Visual Studio Code with the AL extension installed. Unzip the files to a folder, open the folder in Visual Studio Code, run the Download Symbols command, and press F5 to debug/compile. Doing so will result in the creation of a .app file in the same folder you unzipped your solution to.
This .app file can be uploaded to your production environment by navigation to the Extensions page, and use the Upload Extension action on the ribbon to upload your .app file. The steps to get from the .zip file to the .app file may seem daunting the first time you try it, but this who process takes just a few minutes. And once you upload the .app to Business Central, the validation process is automatic and takes just a minute or two.
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