You can use Swiping to collectively select separate values spanning two separate columns to merge the columns into one. You will be prompted with the following message:
Would you like to merge column [<ColumnName1>] with column [<ColumnName2>]?
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Click Yes to merge the columns displayed in the Line Item Extraction Verification panel into a single value under the same header.
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Click No to populate the merged value in the first column without merging the second column.