Can I move from a Skills in Demand / TSS (subclass 482) visa to the subclass 186?

The Temporary Residence Transition stream is the usual pathway from a temporary employer-sponsored visa (such as the subclass 482) to permanent residence under the subclass 186.

It is for skilled workers who have worked for their nominating employer in the nominated occupation and now want to stay permanently. You generally need to have worked for that employer for a required qualifying period.

Your employer must nominate you, and the position and your employment history need to meet the stream's requirements. The exact qualifying period and conditions are set out on the official page for this stream.