Ron -
I suggest three main sections for cold water, warm water, and saltwater.
Within each section I suggest separate categories for dry flies, wet flys, nymphs, and streamers. Another separate section on terrestrials is optional. List the flies alphabetically within each category, and some flies will belong in two of the main sections, not likely all three.
If the search function will handle it, search could be done, e.g., on main section ( cold water ), category ( dry flies ), and fly name ( parachute adams ).
John
The fish are always right.