Hello, @geumdori.

I understand the importance of being able to add the total number of items when recording invoices in QuickBooks. Though this feature isn't available as of the moment, I'll be sharing you a workaround to show this information. For now, you can add the total on the Description column so it becomes available when printing or emailing the transaction.

I've added these screenshots for your visual reference.

For additional reference about invoices in QuickBooks Desktop, check out this article.

Also, feel free to open this link and hover your mouse to the Income and expenses section for more information about managing your income and expenses in the future.

I hope you will find my recommendation useful. As always, add a comment below if you have any other questions. I'm here to help however I can. Take care!