For example, you want to add a and b, and then multiply c and d, if a condition is true. Do the following:

select x;

case x == true
    a+b
    c+d
so on and so forth...

x='B'

select x;

case x =='A'

    disp(x)

case x=='B'

    disp(x)

end

     

you can write multiple cases like this