Customizing subsystem numbers in generated code

I am using r2010b. The generated code refers to subsystem numbers (S1, S2).

• '<Root>' : cmp
• '<S1>' : cmp/Subsystem
• '<S2>' : cmp/Subsystem/Chart

I would like to customize the numbering scheme so that a subsystem always gets a predefined number (maybe defined in the description of the subsystem). I have observed that adding another subsystem to the model and then generating code results in re-numbering of the subsystems. And if I do a diff between the earlier and new files, I see a lot of differences (most of which are due to the modified numbers). I would like to avoid this.

Any help is greatly appreciated.

[Kaustubha Govind]

Pawan: I don't think it is currently possible to customize the subsystem IDs. I would recommend confirming this with MathWorks Tech Support and have them file an enhancement request if the functionality doesn't exist indeed.