You can quilt in section simply by cutting the batting into 3 pieces. Quilt the middle piece first, then attach a side piece of batting using nylon tricot fusible ("batting tape") and quilt that, etc. This reduces the amount of bulk under the arm of the machine, but the fact that you have quilted in sections is not visible in the finished quilt.
There is a technique for doing this so you don't get messed up. It's important, for example, to create registration marks on your batting before cutting so that you can re-position the batting exactly as it was before you cut it. You also need to leave several inches on each side unquilted, so that you have room to re-attach the batting pieces.
Marti Mitchell (sp?) has a book out on different methods for quilting in sections, and I think this is one of them. I actually learned this method from one of Debra Wagner's books.