Hi Jeremy,
Thank you for using Syncfusion products.
We have analyzed your queries. Please find the response for your
queries below,
Query 1:
You can use the MultiColumnDropDownControl as Editor. We have
prepared the sample based on this and please find the sample under the
following location,
Sample: SampleGridMultiColumnDropDownList.zip
Query 2:
We regret to inform that the MultiColumnDropDownControl don’t support groping operations.
Please let us know if you need further assistance.
Thank you,
Jai Ganesh S