My projects are all unique, and I want to display the details on the estimate, but not the invoice. I haven't found a way to do that with groups.  On Quickbooks Pro Desktop, I create another invoice and send a pdf of it to the client. Then I make it non posting.  When they pay, I apply payment to the invoice with all the details ( that I never sent).

Create the invoice with ALL the information that you want to keep track of, even the things you don't want to display on final invoice.  Make sure each category has a subtotal line. Save invoice.

Using LISTS / Item List / Item / New,  create a placeholder item where you will enter the text, ie "Equipment Rental".  It doesn't matter how you describe it, but the Item name/number, if it displays on the invoice, should be coded. I use "te" for total equipment.  Do NOT use SUBTOTAL as type when creating this item, even though it will be a placeholder for your subtotal.

Duplicate the original invoice.

Jump to the subtotals in the document and add a line above with the new item and simply copy the calculated subtotal amount to the item cost. Delete every line item that was used to create the subtotal.

Print to pdf and save the invoice. Email invoice - but not from within Quickbooks!  Make this duplicate invoice non posting.

What you give up is the ability for the client to pay through the QB Payments services, but I don't use this procedure with many clients. Hope this helps someone.