Hi Cyril,
Issue 1: (copy also formula)
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It is possible to copy formula using template markers. Here is the sample for your reference:
http://websamples.syncfusion.com/samples/XlsIO.Windows/F60415/main.htmIssue 2: (copy conditional formatting)
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Currently it is only possible to copy styles using copystyle. But it is not possible to copy conditional formatting. Sorry for the inconvenience caused.
Kindly let me know if you have any other questions.
Thanks,
Melba