Reformating Phone Numbers

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I am a first time user of a Filemaker 3.0 Pro and I have a database that has Names, Addresses, & Phone Numbers in a list. The problem is that the Phone Numbers are a straight 10 digits (without the hyphens). I need to reformat the field to include the hyphens. There are approximately 3400 entries on this list. Too many to add 1 at a time. Is there a way to add the hyphens to the numbers all at once. I am using Windows 98 and am a relative novice to computers, but do possess some very basic skills.

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Put the field on a layout, put your cursor in it, then go to Records->Replace and select 'Replace with calculated result'. Paste this calc into the Specify dialog and substitute phone with your field name:

Left( phone, 3 ) & "-" & Middle( phone, 4, 3 ) & "-" & Right( phone, 4 )