Hi Taymour.Lank.Farawilla,
As per my understanding, you want to divide one column into more than one then use the same column name in column header. To achieve the goal, we can use merge cells in Reporting Services of SQL Server.
To split the value of one column to multiple columns, we can use LEFT, RIGHT, SUBSTRING functions as Javier mentioned. For detail information, please refer to the following steps:
1. Create a Report Server Project with Business Intelligence Development Studio(BIDS) or SQL Server Data Tools(SSDT).
2. Create a new report definition file.
3. Create data source and dataset to retrieve data for the report.
4. In the Toolbox, click Table, and then click on the design surface and drag the mouse.
5. Right-click column handle, then click expression, type the expression like below to get part of the column value:
=Split(Fields!EnglishProductName.Value,",").GetValue(0)
6. Select the columns you want to merge, click Merge cells, then type column name.
The following screenshots are for your reference:

For more information about Creating a Report Server Project, please refer to the following document:
https://msdn.microsoft.com/en-us/library/ms167559.aspx
If you have any more questions, please feel free to ask.
Thanks,
Wendy Fu