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There is no direct option available to create custom paper sizes in MS Excel; however, you can set a custom paper size for your desired worksheets when rendering an Excel file to PDF format. This document explains how to set a custom paper size for a worksheet using Aspose.Cells APIs.
Aspose.Cells allows you to set a custom paper size for a worksheet by using the customPaperSize method of the PageSetup. The following sample code illustrates how to specify a custom paper size for the first worksheet in the workbook. Please also see the output PDF generated with the following code for reference.

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