On the Data Sets tab of the New Manual Column dialog, you can add the Manual Column to an Existing Data Set or a New Data Set.
If you check Add to Existing Data Set, specify to which data set you want to add the new column.
If you check Add to New Data Set, enter a name for the new data set.
Notes: If you have multiple data sets in your table, the new manual column will be added to all data sets unless you have a column or cell selected in one data set. If a column or cell is selected, the new column will be added to only that data set. You can also control which data sets will receive a new column by clicking the Data Set tab and selecting the desired target sets.