Fetch value from a child table to a custom dialog box

Hi guys, I need some help with loading a value into the dialog box
I have created a button inside a child table,when selected it leads to a custom dialog box.what i want is when an item is enter into a row and after that the when the button is clicked i want that item to be displayed in one of the field in the dialog box.

Can Someone help me

Got it…

Thank you

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