im not quite sure what you're asking.
do you mean something like, what's the difference between using 10% of this malt vs. 20%?
if you're asking what the general proportions of specialty to base malts are, i'd say as a general rule of thumb, no specialty malt should be over 10%. The remainder (~60-80%?) would be a base malt(s).
if your question is indeed about proportions of malts, i always google the malt in question and check websites that either sell or create said malt, because they usually give you great descriptions of what the malt does, and recommend how much to use.