MysteriousBee56 when you execute your code once it will appear in the server (with all fields pre-populated based on your setup/git etc.) once it is there you can "clone" them and move them around.
Is this what you mean?
A bit of background, the idea behind Trains is that the environment definition (i.e,. git repo packages etc, code entry arguments etc.) is collected when executing the code. This avoids the tedious task of generating and maintaining YAML/Json configuration files.
What is exactly the use case for the pre-populate ?