Did you ever find a solution? I too do manufacturing. I use bundles but they contain about 35 items which seriously bogs down QBO. Multiple "My Experts" calls later, I was told QBO cant handle that much data in an estimate or invoice. So I am wondering what other manufactures are doing when they build an item out of multiple components to sell it. Would calling all the items in my bundles non-inventory items eliminate the lagging issues? If I create and invoice or estimate and I sell 3 or 4 bundles (each bundle containing about 35 items) I will have a growing lag in the program. Every time I move the cursor to another filed it lags.  It starts at a 30 second lag then builds to about 5 minutes. Some of my bigger estimates or invoices can take 2 hours to build. If I cant find a solution I'll need to find a new software solution. Manufacturing