SSRS display static row as header at each page
Static row as header
On the right side of the Grouping pane, click the down arrow, and then click
Click the static member that corresponds to the static member (row or column) that you want to remain visible while scrolling. The Properties pane displays the
Tablix Member properties.
In the Properties pane, set
RepeatOnNewPage to True.
KeepWithGroup to After.