While importing products/services using excel sheet, I can't find a way to add "Class" to each product?

Hi @mohamedmansour-d, I'll share details about importing products or services.

As of the moment, there isn't an integrated way to add class while importing products or services. Instead, you can assign a class to each item after importing them into your list of products and services. 

While the option is not yet available, I recommend sending this request directly to our developers via feedback. I'll show you how.

1. Go to the Gear icon.
2. Under PROFILE, select Feedback.
3. Enter a few describing the option to include class as one of the mapping columns while importing products or services.
4. Select Next.
5. Click Skip and send message.

I'm adding this reference so you're able to track the status of your request as well as the latest updates from our developer team: Customer Feedback for QuickBooks Online.

It'll always be my pleasure to help if you've got other questions besides this one. Use the Reply button and leave your comment below so that I can assist you further. Take care always!