ItemGroupCode as ItemGroupName

Hey All

I'm trying to upload OITM table to the matrix, and in the Group Name i need to link the ItemGroupCode from the OITM to the ItemGroupName from the OITB.

For example, this is how i do it now:

oDBDataSource = oForm.DataSources.DBDataSources.Add("OITM");

oColumn = oColumns.Item("ItemCode");

oColumn.DataBind.SetBound(true, "OITM", "ItemCode");

how can i use the PK-FK table OITB??

Thank You!