There are actually 3 ways to do this
1) [% INSERT "whatever.txt" %]
Inserts the contents of whatever.txt without doing any template substitutions on it
2) [% INCLUDE "whatever.tt" %]
This processes the template and inserts it. Variables are localized (i.e. changes to variables in whatever.tt are not reflected in the parent template)
3) [% PROCESS "whatever.tt" %]
Same as above but variables are not localized. (i.e. changes to varibles in whatever.tt are reflected in the parent template)

More information can be found here here

In reply to Re^2: Headers in Template Toolkit by amw1
in thread Headers in Template Toolkit by Thargor

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