Add a new record(s) by right-clicking on a row number and selecting Add Records. You are prompted to enter the number of records to add. Selecting Get Record Count from Clipboard, will add the number of records based on the number of rows (records) currently on the Windows Clipboard. Records are always added to the end of the data file and populated with system-missing values for variables of Type Number and blanks for variables of Type String.
Insert a new record(s) by right-clicking on a row number and selecting Insert Records. You are prompted to enter the number of records to insert. The new record(s) is inserted before the record of the highlighted row number and populated with system-missing values for variables of Type Number and blanks for variables of Type String. If non-contiguous records are selected, Insert Records will insert the number of records specified before the first highlighted row.
Delete
a record or group of records by highlighting the row numbers of the
rows you want to delete, right-clicking and selecting Mark
Selected Records for Deletion. The records are marked for deletion
(grayed out in the data grid) when you save the data file using the
Save Data toolbar button 
or File|Save|Save
Data or File|Save|Save
Data As. Records selected for deletion can be contiguous
or non-contiguous.
Records that are marked for deletion can be undeleted by selecting the deleted rows, right-clicking and choosing Unmark Selected Records for Deletion.