I believe each nodule where the leaves come out have the potential for roots.
Leave it attached to the main plant, pinch off leaves close to the stem but not so close as to damage the inside shoot next to the stem, think proper tree limb trimming, lay the plant down under the substrate horizontally, cover with substrate maybe 1/4 inch and wait a couple months for new plants. This works for garden variety Bacopa.
After you get some good roots on each segment and a size you like and you want to move some pieces, cut the stem between the nodules and replant.