Yes you can. I always cut mine down to about 3 inches from the soil line, trim the roots and repot for the winter. They do just fine. I also root a few cuttings for 'insurance'. I've been doing this for years now and they respond well to this treatment. The spend the winter in a greenhouse where the heat goes on at 40 degrees.
The only Abutilon that doesn't doesn't come back nice and bushy is the A. megapotamicum, but it's hardy in my zone so it stays outside.
