Cloning specify columns in layouttemplate of listview in asp.net

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C#

ASP.NET

I've a listview with LayoutTemplate. Designed a table with few columns and rows(say 3 columns and 8 rows).4th column is a placeholder to add new columns dynamically.

Initially I'll show the listview with EmptyDataTemplate

Additionally I've a Button where I need to copy specify columns(Columns with textboxes in all rows) alone and put in the placeholder.

How can this be achieved? In short: Copy the columns and place it in (listview.layouttemplate.table1.placeholder)??