I need to build a report on search phrases that users are entering on our site via two methods - a quick search and an advanced search.

I've created a meta tag to capture the search phrase: i.e.:

<meta name="WT.searchPhrase" content="bill gates">

And an additional tag to distinguish between advanced search and standard search. I.e.:

<meta name="WT.searchScope" content="Quick Search">

I need the searchScope to be used as the top level and the search phrases to be below these - in a similar way to the standard search engine phrase report (this uses the search engine used as the second level)

Can anyone point me in the right direction?

Many thanks!

This sounds like a perfect application for a custom report, but you can also do it with an ordinary URL Parameter Analysis. In either case, they will be 2-dimensional reports, with
SearchScope as the primary and SearchPhrase as the secondary dimension/parameter.