For grouping in gridView you need to use
Nested GridView which will solve your problem for sure, please refer some threads:
This article presents how the GridView control can be nested:
Multilevel Nested Master/Detail Data Display Using GridView[
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Build a Nested GridView Control with ASP.NET[
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The next article, will shows how you can override Render event to create group header based on your sorting column.
Creating a Customized Sorting User Interface (C#)[
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You can use Edit permissions in
Grid View[
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GridViewHelper[
^] as the name suggests, a helper class to aid the creation of groups and summaries.
Hope it helps!
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