Ice cream is cold. Phos desires cold. Does Phos desire ice cream or just cold.
Take all remedies which are averse to cold - see which of these still desires ice cream.
Find only 5
So if you are seriously taking this desire into account and it is very strong in the case then these will be the 5 main remedies to look at and see whether the rest of the case matches.
Don't take it too seriously. Just exploring an idea and playing around with the computer. I din't double check the remedies at all. The whole exercise took a few minutes.
However I believe there is some merit to the underlying logic.
Maybe I missed the point of the question - are you asking how to use Kent Homeopathics' Program called ReferenceWorks? If so I have no doubt they would be more than delighted to give you a comprehensive explanation.