Open an existing running project—navigate to Cost Estimate, and in the Project Expenses section, click on Edit Project Expenses:

Edit project expenses
On the next page, you'll see a blank form for entering project expenses.

Project Expenses Form
For illustration, we'll record the following items:
| Name | Purchase Price | Selling Price |
|---|---|---|
| Copywriting | 800 | 1,200 |
| Travel Expenses | 200 | 0 |
After filling it out, our form will look like this:

Completed project expenses form
Here we can see that the total cost of the project is $1,000 while our revenue will be $1,200.