You can already do this. Just copy a row (coin) in the program and paste into notepad++. Save as something.txt open in excel. Then run text to columns under data tab. Select tab as spacer, and make sure space or others are not selected as separator. Now you have a template you can just duplicate rows in excel. To import changes into program, just select one or many lines in excel, then ctrl+c and then left click and paste into opennumismat.
OpenNumismat
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Please add an import feature for xls files. thank you