toncelli,
I recently had a similar task and needed to rely on Spreadsheet::ParseExcel and Spreadsheet::WriteExcel as the work was being performed on a *nix platform. I found Re: open workbook-WriteExcel helpful but I had to break encapsulation several times to preserve formatting when modifying existing cells. Let me know if you go this route and have specific problems.

Cheers - L~R

In reply to Re: Modifying an existing Excel file by Limbic~Region
in thread Modifying an existing Excel file by toncelli

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