How can I insert prewritten lines of HTML automatically into an HTML file?

I have a report that automatically generates in HTML format. I usually tweak this report myself by adding a few lines of HTML in specific places and writing whatever needs to be written in those lines. I need a way to automate this process so that other people can do it with minimal to no knowledge of HTML.How can I insert prewritten lines of HTML automatically into an HTML file?
Either the people editing can use a WYSIWYG program like Microsoft Expression Web or Adobe Dreamweaver, or you could use a ';tag'; system similar to BBCode ( http://www.bbcode.org/ )

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