[OS X TeX] a stupid question

Wed May 27 17:03:06 EDT 2015

I recall a mention sometime ago of an "experiment" option in the TeX editor that allows one to test a part of a larger document without having to create a new file, etc.  I have not been making intense use of TeXShop over the past few months but now would find this feature useful.  Can anyone tell me how to access it?
I'm running Version 3.51 on OS 10.8.5.

Zbigniew Nitecki
Department of Mathematics
Tufts University
Medford, MA 02155

telephones:
Office    (617)627-3843
Dept.    (617)627-3234
Dept. fax    (617)627-3966
http://www.tufts.edu/~znitecki/

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