I figured it out!!  

1. Click on the Gear (⚙) at the top.
2. Select Account and Settings.
3. Select Sales.
4. Select Customize look and feel. From here, select to edit or create a new Custom form.
5. Select your style of form, then click Next.
6. Click Content, and then click on the pencil icon in the middle section of the sample invoice.
7. Click Show more activity options.
8. Select Group activity by to Type.
9. Choose whether to Subtotal groups and Collapse activity rows.
10. Click Save.

This came from a link that I was not allowed to post for some reason, but it works!

Follow the steps, and play around with the settings until the invoice displays the info that you want your customer to see.  You can create an invoice with all of the line items and markups, but it will collapse everything on the invoice that is sent to your client to either groups or one single number.  Once you change the settings, you have to create a test invoice and click print or view PDF to see how your customer will actually see it.  Hope this helps!!