I have an avocado tree growing inside from seed and it has two trunks. It is about 1 1/2 feet tall and 1 year old. Would cutting a whole trunk off kill it?
What Should I Do if My Avocado Tree Has Two Trunks?
No, but why would you want to? If you're planning to keep it as in indoor ornamental, 2 trunks would seem to add to its appearance. Here's more information on pruning your little tree: https://www.gardeningknowhow.com/edible/fruits/avocado/pruning-avocado-trees.htm