It depends if it is for the same datatable or that you want to put it in an other datatable. Just add a new row to the order table, then add new rows to the orderdetails, then fill columns with the appropriate values from the original data rows.
Code:
Dim drNew As DataRow
'Add Row 0 with Manufactred Product details
dt = dtOrderDetails.Clone
drNew = dtOrderDetails.Rows(0)
dt.ImportRow(drNew)
Be aware that with strongly typed datasets the merge is an important method, while it is in my idea with non typed ones mostly ignored.
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