Microsoft project management software used to plan, manage, and communicate a project schedule and other information among workgroup members, project managers, and other stakeholders.
Dear Nicholas Bombardieri,
Good day! Thank you for posting to Microsoft Community. We are happy to help you.
We understand that you are trying to edit Budget, Budget Baseline Cost, and Fixed or Actual Cost fields added in Project Online desktop app.
As per the test on our side, it seems by design that we can only enter in Cost and Fixed Cost field as shown below, and other columns such as Actual Cost are set to be calculated by default.
For your reference: Baseline Budget Cost fields - Microsoft Support
Budget (resource field) - Microsoft Support
Actual Cost fields - Microsoft Support
We hope the above can help. If the understanding above is not consistent with yours, please feel free to post back and point that.
Your understanding and patience will be highly appreciated. We hope that you are keeping safe and well!
Sincerely,
Rhoda | Microsoft Community Moderator