Install Multiple Environment.yml

Is there a way to install multiple environment.yml files? I have an environment that I’ve created from the fastai repository, but I would also like to add the requirements from fastaudio. Is this possible? I haven’t had any luck with the searches I’ve tried so far and the one thing I did try, created a new environment instead of updating the current:

(fastai_audio) kbird@kbird-desktop:~/development/fastaudio$ conda env update --file environment.yaml