Thanks for joining this thread, @Ben Wolfram. 

I see how tiring it can be to add the transactions again since you forgot to click Save after making changes. The option to have a history for your estimates and invoices is currently unavailable. 

We are striving to improve QuickBooks so please know that we're taking note every detail of your suggestion. Rest assured, I'll also share this along here on my end. 

You can keep updated with our latest news by visiting our QuickBooks Online blog. For more useful topics, feel free to browse them here in our Community page. 

I'll be here to lend you a helping hand if you have other concerns, @Ben Wolfram. Have a great day.