this is what you do:
- cut off some nice stems from your existing coleus
- place them in water (cut off some of the smaller stems at the bottom of each piece, if needed)
- add water as needed
- after you see a pretty good amount of roots form, place them in a planter with potting soil
- water as needed
- in the spring, replant to outside pots and enjoy all spring, summer and fall
and this is a picture from a couple of months later, still going strong. just be sure to add additional water when needed.