How do I install pluming drains under slab foudation

Thank's for the response to my question about drains under the slab.I guess for a new construction the same rules apply without having to cut cement. Is it safe to say that with new install I would layout all my drains and traps and connect to the main drain and stub up for main stack for venting,cover with gravel and then make the pour?Is pvc 40 acceptable under cement slab and is pex tubing acceptable under slab?

You will need to cut the concrete slab and dig down deep enough to lay your drains lines with a 1/4" slope per foot and the traps. Back fill with gravel and recement. You will need to tie to an existing vent stack or install one up through the roof line. Are you looking for more details than this?