How to bring the Header value to the row ?

Dear All,
I am a starter in learning SDK. have developed a form having 2 tables a header and a row detailed one.
Now i need to update a field in all the row with a header value when the header value is added. it should be like the SE name getting updated when the SE name is selected in header level in std doc.
how to arrive it?
kindly help me to achieve this.
Thanks,
Sam.

Dear Gordon,
May the customer enters a value to the header which they want it to be unique value for all the row detail.
If there exists more than 50 rows they cant enter it for each and every row, for in case if the value needed to be changed for a particular row or for particular few rows they will change it manually to that row alone.
I just want to achieve this scenario in my form.
Do you know how to bring in ?
As this is being a normal functionality in Std forms.
Thank you...

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