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collection on form; design considerations without database

 
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Hi everyone. I would like to know the basic principles to create the following. I have tried but I can't seem to figure out the small missing logic.
I have a page that inputs a ColumnBean to define a column of a database.
Lets say the inputs are: 'name' and 'type'followed by an "Add Column" button.

On the same page at the bottom, I have a table showing the columns. When I submit to my action, I am not using any business tier to maintain this collection of columns. How do I delete this column?

Any ideas are greatly appreciated!!!
 
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