Frodo nailed it using a wye with a 45. The existing combo servicing the bathroom sink should not be touched. That is an old technology using lead and yokum joints. Breaking the seal and causing a leak will create a nightmare for you to fix (you may have to yank out everything and reinstalling all new piping). To the left of that combo I see cleanout. That may be your best bet to make the tie-in somehow. As for using a reciprocating saw to cut cast iron I'm not sure it will cut it but you could try. A chain cutter is usually what I used to cut cast iron pipe. Good luck and keep us posted on the progress.
thats not a tee, its a combo. if you replace a combo with a double combo. you need to see if the combo you are replacing is DEAD level. because, if one side of the double combo is raised, the other side is backfalling. so to answer your question,,not a good idea. remove old combo,,replace it with new, add a wye and a 45 for new drain..buckle them in with cast iron x plastic mission bands use pvc do not splice into the water line under the floor, loop the pex up into a wall, tie in above ground no joints under concrete
I just thought of something. The cleanout is probably connected to another combo. See if you can remove the cleanout and use a sanitary tee to sit on top of the combo below. From there you can run your kitchen sewer line into the sanitary tee. Note that for waste line purposes a sanitary tee can be used upright (it cannot be laying down like a combo).
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