Hi,
I'm a little fuzzy on what you mean by "select". Do you mean you want the user to select a Product Class in each row of the grid, and then a Product Line in the next cell of the same row, but only show the Product Lines that apply to that Product Class?
Or are you talking about showing all of the data and only letting the user select certain rows by highlighting them?
Or do you mean you want a CheckBox in the rows?