One of the great things about custom report types is that you can renamed the field labels on the columns. This could be done if say you wanted a CSV export to have column headers that confirm to a naming standard other than your current salesforce field names. However, with great numbers of fields, comes great amounts of time renaming the field labels. Is there a way that I can perform a mass update to a custom report type to change the labels on a field. I do have a CSV that maps the Salesforce API name to the new Label, just not sure how to do it programmatically.
The only way I can think of to do it is to edit the XML for Custom Report Type directly, and to change the labels in that. You can do it with Eclipse, etc.