Cutting and extending ABS

[hans_idle]

In the picture below, I have 2 ABS "T" pipes. One is on the left, with the upper end going to the roof vent. The right-hand "T" is for a sink drain, and then it continues a few feet to the right for another sink.

I need to move the right-hand "T" in the picture to the right about 20" because I'm moving my cabinets and sink over. But if I cut the ABS between the 2 "T" pipes, then I won't have any pipe to put a coupler onto. If there was an inch or two between the "T" pipes, then I could attach the couple to that, but they are right next to one another.

What is the best way to separate and repipe this? I suppose I could cut out both "T" pipes along with a few inches on the vent stack, then put couples on the vertical pipe along with a "T", and then run the line to the right.

Oh, and the insulation was ripped before I got to it

Thanks!

-Hans