The Confirm New Model dialogue will appear if you issue the New command from the Model menu after you have made some changes to the model since you last saved it. If you do not wish to keep these changes, click on OK to dispose of the current model and start a new one. This action can not be reversed with the Undo command.
If you do not wish to lose your changes, click on Cancel to return to editing your existing model. You may then choose to save the model to a clean-component table.