My list is all mixed up! Can I revert ? 12 columns

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Excell keeps messing my list up. I probably typed in a something interpreted as an instruction.  I’m a clinician and have a 1000 line list with 12 columns containing a mix of numbers , dates and text.  This has happened to me twice in the past 6 months and it takes 5/6 hours to fix! Any ideas anyone please on how to prevent this from happening or indeed a way to revert my list. I have no macros I just literally made the list myself. It’s basically my own database for my business. Any suggestions help would be wonderful. I’m no tech wizard so would appreciate any help thanks  

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