Last time I wrote about Designer Help. One reader correctly pointed out that if I wasn't so lazy, I just had to add the word 'formula' to my search string. An even better answer came from Julian Robichaux at his session at MWLug last week. It is to set the search scope.
It is not real intuitive, but click the link, select 'Search only the following topics', click 'New', name your list, and select only the stuff you want. I always wondered how items for Workbench and Sametime showed in my search results.