If cutting them into smaller sections is not possible yet...plant them into shallow, plastic, storage containers that are used for blankets, sweaters, linens etc. The are usually very shallow, and are made to slip/store under a bed. Home Depot has them, as well as The Container Stores, Bed, Bath, and Beyond....etc.
Fill them with growing medium after drilling some drainage holes, and you're good to go. These shallow storage containers are also very easy to bury, in-ground, when you want to use this method for rooting longer stems. Then, just lift the boxes, and continue the growth cycle until they put out a good root system...then you can divide them into individual sections. Just another alternative.
Frank