The question is abstract. I am not clear if you are looking for a physical system with higher transfer function or you just randomly want to create one.
Basically order of the denominator will decide the order of the TF. You can right a higher degree equation in the denominator to crate such TF.
You can do it in MATLAB using code like below:
>> num =1;
>> den = [1:30];
>> tf(num,den)
