PPST point OF SYTM

Pls give me more detail or manual of this.

for ex: I create one SYTM with a MRKP, After that I create one SLAB in one drawing and refer to this SYTM. So how I can change the origin?

Pls give me more detail or manual of this.

for ex: I create one SYTM with a MRKP, After that I create one SLAB in one drawing and refer to this SYTM. So how I can change the origin?