Rather than cutting out a large section of the cabinet to remove it it is usually far easier to cut off the ends of the pipes and cap them with easy to use push on fittings which will work with copper cpvc or pex plumbing pipes.
Capping off toilet soil pipe.
Removing toilet capping off soil pipe post by white pan man wed jul 20 2011 10 40 am as said but do not do to good a job on filling it in as a drain is often a useful thing and could come in handy in the future.
End cap for main drain out let.
I have got to remove a toilet and cap off the cast iron waste.
Unscrew sink lift away.
Sink 50mm 2 inch cap.
This will require considerable time and effort as well as some specialized equipment.
This will involve removing a portion of the surrounding concrete removing the floor flange which may have to be cut out and then the capping the pipe.
All i can think of using would be a 4 inch bung like used to testing.
Plumbers will stock caps you will need to measure across pipe axample 100m 4 inch main pipe cap.
These are generally made of rubber or the cap is.
Sink disconnect pipes place end caps to water pipes disconnect out let pipe cut of to desired place cap of pipe.
Once this has been completed the concrete will have to be repaired and the flooring replaced to permanently conceal the pipe.
Water pipe 1pm caps.
It is half buried on a concrete floor so not easy to cut how do you normally go about capping or plugging these.
To permanently close off the pipe in a concrete slab the floor flange should be removed and the pipe capped below the floor surface.