long line to paragraph all indented

version 7.4 on ubuntu
non-gui

given a long line indented to some nominal number of spaces, how can
I format this line to preset paragraph width but with each line in
paragraph retaining the original indentation.
example:

Pour the remaining sauce over the enchiladas. Cover with leftover cheese and bake for about 20 minutes or until cheese is bubbling.

becomes:

Pour the remaining sauce over the enchiladas. Cover with leftover cheese
and bake for about 20 minutes or until cheese is bubbling.

thanks
--
Tim Johnson
http://www.tj49.com

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