Hi Hiren,
Try the following:
Steps to achieve it
1. Select the tabix and click on Tablix properties.
2. In the General tab under Column Headers section you can see "Keep header visible while scrolling" checkbox, check it.
3. Now the header row will be remain fixed in the report.
OR
1. In the grouping pane, make sure to turn on advanced mode (click on the small black down arrow on the far right of the grouping pane)
2. Select the corresponding (Static) item in the row group hierarchy
3. In the properties grid, set RepeatOnNewPage to true
4. KeepwithGroup to After
OR
1)Freeze the header of all columns[ Freezing table header ] : To do select static member of table header row from row groups [ Advanced Mode ] and set FixedData to true
2) Freeze the initial 2 columns : To do select static member of columns in column group and set fixedData to true
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