How can I properly arrange subsystems through M script.

I am using MatlabR2015a (latest available with me) Suppose there are 4 subsystems arranged as shown in fig. I want to create a script which allow me to decide position of each subsystem.

E.G. Subsystem B should be placed below Subsystem A as they are sharing few common inputs. Similarly Subsystem C should be place Next to Subsystem A, as most of the inputs to Subsystem C are coming from Subsystem A. And so on. Can someone please Help Me?