I have some Anacharis which is sending out new growth, can i cut off that new growth and root it without it dying, then it send out new growth and get a forest going?
If you want a big bushy grouping, then just reach in, snip the plant at the height you want, and plant the top piece. The bottom part that you left planted will branch, and the top part will continue growing.
You can just cut off any side shoots whenever you think they are tall enough.