Syncing Sharepoint 2013 List from Excel 2010 spreadsheet?

So i'm trying to figure out a way in which I can append items within my SharePoint list by inserting the data from an Excel Spreadsheet.

However, the SharePoint list has additional columns which are not present on the Spreadsheet which I don't want to override. (So I can't simply just copy and paste the data over).

Does anybody know an easy way to do this? Or does this kind of functionality only come with a SharePoint add-on?

Thanks,