@hjk  RE: The "soft limit" of line items is about 100 items. beyond that forget about trying to make changes to an invoice unless you're patient enough to wait for 10 seconds after every mouse click.

Wow, that's really lame! QB Desktop, which Intuit marketers think QB Online can somehow replace, easily supports 1,000's of line items. I think I created an invoice with 3,000 line items once, just to see what would happen. And it worked perfectly fine and didn't slow down at all.