Highlight iBountyHunter.xcdatamodeld.

Then go to the Editor→Add Model Version menu option. That will generate a new file under the iBountyHunter.xcdatamodeld directory called iBountyHunter 2.xcdatamodel.

Set the current version.

Highlight the iBountyHunter.xcmodeld directory, then select the File Inspector on the Utilities Pane. Then in the Versioned Data Model section, select “iBountyHunter 2” as the Current version.

Update the new data model.

Select iBountyHunter 2.xcdatamodel and re-edit the data model to add the captdate and captured fields back in as we did before. Now the old version is preserved and the changes are where they belong.