How can I track expenses for active projects?

Hello, is it possible to track expenses for individual projects? Thanks!

What do you think of adding a custom field (type currency) to the Project Tasks module?
Then you could have a sum thanks to the Reports module.

Or if you are a developer, you could achieve the same goal inside the Project Tasks’s Detail View and the Project’s Detail View through code

This is great. I was able to create the custom field type currency and create a basic sum report. How can I create a report that not only shows the sum of all projects, but also the sum per project?