As an aside - and depending on what your write note is for :-
I ensure that any challenges that I have researched and qualify for I change the co-ords to 'amended' (so they show as italic)
That way I can search for these (on GC website) with the filters
Found Status - 'unfound'
Geocache type - 'unknown',
Geocache name contains - 'challenge' and
Corrected co-ordinates - 'Updated coordinates only'
That gets your list of qualified for challenges
You could additionally create a list for all of these