Just be careful before buying the suiteapp if you do. it doesn’t actually create a real consolidated invoice but helps you generate a PDF that combines and summarizes items across multiple (same currency) invoices for a customer. It ships with a few basic templates @karlenigma . In order to modify and stylize them you’ll have to edit the freemarker templates quite a bit and the searches that create the end results. I even had to modify the scripts and custom records that came with it just to add some functionality that was missing around displaying non-us taxes.
netsuite can help with an implementation but they didn’t tell me that up front so i found out the hard way.