How do you create a Datatable with a non-unique index on a column?

Hi
I have a strongly typed datatable which has a column that I perform a
search. To speed it up I would like to add an index to it, however
this column contains duplicate values. Is there anyway I can add it?
I can only find primary and unique keys in the dataset designer.

You must be able to because when you add a datarelation it must create
an index on the child table.

Thanks
Kevin

.

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