To be honest, I like J Scott's approach for 2 reasons. 1st, it's easier to drill thru the COGS details since everything is posted there, 2nd, you can run budget vs actual if you plan to utilize the Budgeting feature to track your progress directly from QBO. It is more of a work around rather than a shortcut. And as long as you keep in mind that COGS for unsold properties needs to be moved to balance sheet to get an accurate financials, then I think it's not a bad idea.
@Mauricio Duarte I don't recommend using Expense screen to view all your expenses since that may not capture all transactions, ie. refund from store processed as deposit or journal entry. I suggest running financial reports (ie P&L or balance sheet) instead. For flips, we usually create custom report to keep track of the project costs and another report to show historical data of all sold properties as percentage of income.
Journal entry can be found in the "+" sign in the upper right hand corner, then under the "Other" group. Again, journal entries will not show up in the Expenses window.
As Gita mentioned, it's important to set up your books and accounting process the right way, the first time.