Bookkeeping when managing 3+ flips at a time?

[Alex Fenske]

For those who manage 3+ flips at a time, I'm curious what bookkeeping software you use and how you keep all the expenses properly matched to each property. 

I use QBO for my corp books and Stessa for my rental portfolio, and I have a bookkeeper who manages those systems. We used Stessa for the flips last year, but as I've increased the number of flips, tying expenses to the appropriate project has become a bear and I'm wondering what others do. Contractor payments, online orders, card swipes at home improvement stores, utility payments... When these payees are shared across all projects, it's a mess tracking what expense goes to which property.

What's the simplest/easiest way to do this?