Capture form values into a gridviews

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Gridview

I want a gridview which will populating values based upon some textbox values outside the grid. For reference Click See image.

Help me achieve this fucntionality :

If Text Quantity is 3 , then 3 Gridview rows will be loaded on subsequent click event of linkbutton Charge To(Requestor) .

Data in other text boxes , how to get that into date columns of gridview.
Total Amount in the top gridview is divided by 3 in the lower gridview.

click on the image regarding to have an idea about the User interface[^]

What I have tried:

please give reference with respect to the above problem.