Probably no need for a secondary vessel step with this. Depending on your fermentation temps up to this point you may not need to diacetyl rest this beer. California Lager yeast is generally fermented higher than standard lagers so the yeast may have cleaned that up by the time its done. I'd taste a sample of it to be sure.
If you want to truly lager this one, I'd say transfer to a secondary and start chilling it down.
However with Cali Lager my experience has been that if you let it go at 60-65 for three weeks, check the gravity and flavor; once its done fermenting you can rack and bottle as normal. Once carbonated you can store the bottles in the fridge and lager that way. Just don't lager then first or the bottles won't carbonate.