Trimming anubias cut the leaves or rhizome, if you cut the rhizome it needs to be underwater with a VERY sharp razor. They are slow growing plants though.
Pennywort just cut it, as long as it has some leaves it will be fine.
Cabomba I am not sure about.
Limnophila aromatica cut it and either float it until it gets roots or plant it and wait for it to grow roots. Make sure the bottom leaves are off before planting though.
I am sure I didn't get all those right so maybe OFL or PewPewPew can come or I would contact them and give them the link.
that picture is from aquastar71 on aquabids .. i can't for the life of me get good pictures of my boys .. lol they just wiggle around or are camera shy ..
i do have one of his white bettas .. tho i don't think it's the same one that he put on his pictures .. but probably one from his other spawns .. still stunning though .. but not exactly him .. i think ..