I want to change the position of the toilet and leave the original position as the drain of the bath

You can't change it in this layer, in addition to recognizing the elevation of the ground, (the use causes serious disadvantage) is also a non-compliant work, easy to block in the future.

If the bathroom floor is sunken, you can move the position, pay attention to the slope, and use a 45-degree elbow.

Add tee to the right side of the post, and then add the PVC pipe to the position you want to place. It is advisable to make a reverse bend in your floor drain pipe.

Where to switch? Get a marker to pass it on and help you design it.

You are on the same floor as the descending board, how do you want to change it, just find a plumber.

Simple, first chisel the cement in the left corner to expose the big DN110 pipe, and then cut off the original thick pipe and replace it with a DN50 PVC sewer pipe, add a 90° elbow of DN50 facing up at the right end, and connect a 110*50 tee at the left end. The bathtub drain is connected to the sewage pipe, and then it's OK. This material should not exceed 50 yuan at most.

Is it too simple, I don't know, your plumbing union charges you this salary?

Take a picture of where your toilet was from the original outlet (and where it needs to be installed now)...There are so many pipes on the ground in your house, aren't you afraid of flooding?

I don't have much material processing fee, 200-300 yuan.