The first one is available from the 'Merge to New Document' popup that appaears when you click 'Finish and Merge>Edit Individual Documents'.



The second one can be created via the Rules dropdown on the Ribbon's Mailings tab. Having inserted that field, you insert the relevant mergefield name and the 'skip' condition (eg:{SKIPIF«myField» = ""}). Without knowing more about your data fields and what they actually contain when you don't want them to be output, I can't be more specific than that.

Note: The field brace pairs (ie '{ }') for the above example are created in the body of the document via the Rules dropodown or via Ctrl-F9 - you can't simply type them or copy & paste them from this message. Likewise, you can't type or copy & paste the chevrons (ie '« »') - they're part of the actual mergefields, which you can insert via 'Insert Merge Field'.

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Cheers,
Paul Edstein
[Fmr MS MVP - Word]