Writing Records to a new file

[Angus McBagpipe]

I do a lot of quotes for much the same materials in an almost infinite variety of configurations.
I have series of metrics that I calculate in every quote I do.
I'd like to be able to write these values to a separate file to create a running record of my pricing.
And continue to add records to that file so that eventually I can make it searchable for given criteria.

Step one ...
How do I output the required fields to a new file as a new record?
I don't want it to over write any of the previous records.
Press a button and there ya go.