Repeat textbox in each page in SSRS.

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SSRS

reporting

I have 2 sub report with form data A and form data B . Each form data has private header. I know i can not display sub report header in main report.
Now i want to display header depend on content form A and B in every page .
Not use sub report header.
My thinking is i will create a rectangle and customize it to repeat it in each page. But i don't know how to do ???
Please let me know the solution.