Is it possible to import data from an Office Excel or Word file into a list in SharePoint (specifically SharePoint Online)?
I have imported data from SharePoint lists to Word files.
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Yes it is possible to import Excel data into SharePoint List. It can be done by creating Import Spreadsheet. Refer this link... http://www.bloggix.com/archive/2010/06/15/import-and-export-data-between-excel-2010-and-sharepoint-2010/
You can also use PowerShell script to import excel saved as csv file.
Here is a link to an example.
With PowerShell you can do some logic too, to make sure it matches your list. E.g. if A equals B then input value C.