There is an existing plan for Subang Jaya by the MPSJ
It is the MPSJ Local Draft Plan 2020

This will be replaced by the Local Draft Plan 2035

It was reported in TheStar - Metro News 19 October 2018, Friday - please read it

From the news, it was mentioned that

The public can view the draft plan, and make suggestions or raise concerns, at
  • MPSJ Headquarters lobby,
  • MPSJ Hypermedia Library in Bandar Puteri Puchong, and
  • MPSJ Hypermedia Library in the 3K Complex, Seri Kembangan,

until 12 November 2018 from 9am to 4.30pm.

You can also
download the DRTSJ2035 app available on Google Playstore
to place your objections or suggestions to the draft plan