End-dating a valid grade and adding a new valid grade for a job using Spreadsheet Loader

Summary:

Is it possible to remove/end-date grades using Spreadsheet Loader?

Content (please ensure you mask any confidential information):

I need to update valid grades on a number of jobs. I was able to create a spreadsheet loader to add new valid grades. However, I can't figure out how to end-date the old grades. Looks like the Effective End Date is one of the available attributes but when I try to add it to the template nothing happens, it does not get moved over to the list of selected attributes.

Version (include the version you are using, if applicable):

23D