Start by downloading a budget proposal, here is a guide on how to do it. Once the budget proposal has been downloaded to an Excel file, it can be edited and uploaded to Boardeaser again.
Go to "Economy" and “Data management” in the left menu. In "Budget files", press the button “Upload budget file” and select the Excel file to upload.
Once the budget file is uploaded, you will find it under "Economy" > “Data Management” > “Budget files”.