This question already has an answer here:
Can you please post the specific code for using \diamondplus and \diamonddot from MnSymbol without loading this package?
The answer to the question Importing single symbol from MnSymbol gives a general procedure. To implement this procedure for a specific symbol different from the symbol used there requires understanding of fntguide document. For those who do not understand fntguide, help asked here is essential. Also, more specific examples can help others gain better understanding of the general method.