Adding a bathroom to a building, someone said they were going to join into the existing wasteline, with some type of above floor flange to hook two toilets into one line. I have never seen or heard of such a flange? Is there such a connection?

Adding a bathroom to a building, someone said they were going to join into the existing wasteline, with some type of above floor flange to hook two toilets into one line. I have never seen or heard of such a flange? Is there such a connection?
No there isn't. A wye will have to be cut into the main and a new closet bend and flange will have to be installed. Good luck, tom