custom function for Admin, submit_line.html, views.py

1) Where is the *.py file and what is his name, in which there are
written functions related to 'Save and add another', 'Save and
continue editting'.... buttons of Admin site.
I do not understnad to which file i have to add custom functions for
admin.

2) How to add a button to Admin (i.e. submit_line.html), which
pressing would call function defined in views.py.

I would like to add "custom functions related to button in
submit_line.html"
in such a way, that i would be able to call from them another custom
functions from views.py

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