Assuming that you want three of labels such as the following, with the 959.704 in both of the right hand cells
delete the «Next Record» fields from each location in which it appears EXCEPT for the third, sixth, ninth, etc Whether that works out exactly, with depend on the number of labels there are on a sheet.
An alternative maybe to set the type of mail merge main document to a Directory type and set it up with two newspaper style columns, with three instances of the label in first column as shown below
If you cannot get it to work, if you send me a copy of the mail merge main document and the data source, referencing this thread ni the covering email message, I will help you with it.