Only the Highest level of education can be assessed . No problem.
However , in certain cases depending on the credential, WES evaluates Masters to be equivalent to a Canadian Bachelors Degree, for which only 21 points will be awarded.
If you need the extra point , then you can have both of your degrees assessed , in this case if WES evaluates both of the degrees as Bachelors then 22 points will be awarded.
You can use the self assessment tool on the WES website to know the probable outcome on your educational credential and then proceed.
Thanks.