Manually select data
Select rows for data records to exclude.
Use 
beside each column name to aid in the selection of records.
Right-click a selected row and choose Exclude from the menu.
In the popup dialog:
Check the box(es) for the desired Exclusion type(s).
Check the Flag box to add a flag column to the output that indicates any exclusions.
Check the Include Flag in PC.XPT box to include a flag in the PC.XPT file about the exclusion.
Enter the reason for the exclusion.
The reason appears later in the analysis, reporting, and SEND output.
Press OK.
The types of exclusions available are configurable (refer to “Concentration exclusions” in the configuration section).
Note: For Exclude from PC.XPT, if there are any comments in the CO domain for the selected records, they will need to be removed before the exclusion can be performed.
To clear a row’s exclusion settings, right-click the row and choose Undo from the menu.