Special Characters in headers and Repeated Headers in the excel how to do it?

Hi,
Does anyone help me how to do Special Symbols and Repeated headers in the Excel

Can you check the below mentioned link.

https://www.extendoffice.com/documents/excel/3131-excel-repeat-heading-row.html

Using Uipath datatable i need to do.

DataTable will not allow to have duplicate column names.