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Aspose.Cells allows you to work with built‑in and custom document properties. Here is the Microsoft Excel interface for opening these document properties. Just click on Advanced Properties as shown in this screenshot to view them.

The following sample code loads the sample Excel file and reads the built‑in document properties, e.g., Title and Subject, and then changes them. It also reads the custom document property, i.e., MyCustom1, and then adds a new custom document property, i.e., MyCustom5, and writes the output Excel file. The following screenshot shows the effect of the sample code on the sample Excel file.

This is the console output of the above sample code when executed with the provided sample Excel file.
Title: Aspose Team
Subject: Aspose.Cells for C++
MyCustom1: This is my custom one.Analyzing your prompt, please hold on...
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