For clarification, how are you counting filter order? Order of the transfer function (number of poles) or order of the filter polynomial (number of pole pairs in case of bandpass/bandstop)? As you are talking about 2nd and 3rd order bandstop, I presume the latter.
Usually filters are designed using bessel, butterworth or chebyshev polynomials. They have unique parameters for each order. A 4th or 6th order bandstop can't be constructed by cascading lower order filters of the same type. But it can be always designed by cascading 1th order building blocks (with 2nd order transfer function) .
Starting question would be, what is the intended filter characteristic (pass- and stop band specificaton)?