how can i add a check box on the tax column in the invoice.the feature is not available on custom fields

Hi, Jhonson. You don't have to add the checkbox manually. It will automatically appear under the Tax column once the sales tax feature is turned on.

If it's already turned on, yet you're not seeing this on your end, I recommend contacting our Live Support team for further assistance. Here's how:

1. Go to the Help icon.
2. In the Search tab, enter Talk to an expert, then click Contact Us.
3. Choose a way to connect with our team.

Please ensure to check their support hours for timely assistance.

Let us know if you have any other QuickBooks-related concerns.