Among the other usual things, you will find some special menu entries here:
When you have selected at lease one row in an opened document, you can create another (new) document which then contains only the selected rows from the previous document. Use this to e.g. quickly create new CSV spreadsheets from search filter operations on existing spreadsheets.
You can create a new CSV data document directly from the Mac OS X pasteboard content.
If you have chosen a wrong encoding when opening an existing CSV file, you can simply reopen the same file with another encoding. The current document will be closed and immediately reopened with the newly chosen encoding.
If a document has been opened, you can insert another document. The data of the inserted document will automatically added at the end of the existing document.
The CSV file can be exported with changed parameters without any influence on the normal saving. As an option, only selected rows are being exported.