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Is there a way to make text "Hidden" and therefore not print or get inserted inot another document?

I do not know what the term "Comment" refers to. Would this operation work?

TextPad is a text editor not a word-processor. It is largely used by programmers who need complete control of every character that is put in a file so that it can be read by a machine with no nasty surprises. Generally a machine will read a file a line at a time a comment is a line or part of a line that the machine will ignore, for instance in the Basic programming language a line beginning with "rem" is a comment.
So I think you need a different tool.