Is it possible to view which sales have tips included? Either a report or a sort would be fine.

[Spenser]

There isn't a report in the Dashboard specifically for tips, but if you download your Transactions history, you'd be able to view and sort your sales by the ones with tips included. 

Read more on downloading your transactions here: https://squareup.com/help/us/en/article/5072-summaries-and-reports-from-the-online-dashboard