GST Registration Amend

Hy All

We have Gst registration of manufacturing of Industrial fan blower, Air cleaner equipment Installation service & maintenance repair service(job works mainly) our HSN code is(841459,842139,8479600, 998717, 998873)

Can we do trading/sell air conditioner on current GST registration no or we have amend our registration later.

If Yes/no Please refer section/Rule 

Thank you