Drag and drop Table report item from item panel into the design area and assign dataset to the tablix data region.

Click on the table surface to enable the Grouping Panel in the design view.

Go to Row Groups pane in grouping panel and open the context menu on the Details group field.

From the context menu, click on Parent Group... option under Add Group category.

Once you click on the Parent Group option, a Tablix Group dialog will be opened to configure the grouping.

Choose dataset field in the Group by drop-down list.
Select Add header to add header row to the group and select Add footer to add footer row to the group. Click on the OK button.

Now, a static row will be added above and below of the group in the tablix data region.

On report preview, the header and footer will be added for each group as shown below.

You can display data, label content or total in the group header and footer of the tablix data region.
Merge Cells option.


Merge Cells option.


= "Total yearly sales of " & Fields!ProdCat.Value using expression builder and set the font weight property as Bold in the properties panel.

=Sum(Fields!Sales.Value) expression in the last cell, to calculate summary of sales field and set the font weight property as Bold in the properties panel.

Edit the header cell and set the = "Sales Report of " & Fields!ProdCat.Value & " Category" expression using expression builder and set the font weight property as Bold in the properties panel.

On report preview, the header and footer will be added for each group as shown below.

Download the above report design from link.