[Cerrado] automatic translations

I wanna use automatic translations, but my site is already translated into 4 languages using Classing Translation Editor. I know I need to switch to the advanced translation editor in order to use automatic translations, but can I safely do that without losing CTE translations? Also I have some specific translation. For example I wanna translate a product with a differnet word that it is usually used in transaltions. I'm goona be using wpml ai credits. My question is: Is there a way I can tell the wpml AI to always use this word instead of the regular one?