According to the provided brief information, it is not clear enough what is the exact requirement that you are trying to achieve. However, I suppose that you want to select a value from a combo column in a row and then populate another cell's value from the same row. You can handle the RadGridView.ValueChanged event and adjust the desired cell's value.
If it is not the case, could you please give us some more details about the specific goal that you are trying to accomplish? Thus, we would be able to think about a suitable solution and assist you further. Thank you in advance.
I hope this information helps.
Dess | Tech Support Engineer, Sr.
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