How do I introduce small corn snakes to aan adult corn snake

If we're talking snake etiquitte, I'd introduce them the same way you'd introduce your little brother to an adult but with snakes, I'd do it through the glass of separate cages. Snakes are sometimes canibalistic and the bite-size little ones may never make it to adulthood in the same cage with an adult.

Manners are really important so do the following

Mr. or MS. Corn Snake, I would like to introduce myself, I am a junior Corn Snake. and would love the opportunity to join your abode.
Thank you

you'll be feeding the small snakes to the big one. snakes as a rule should never be kept in the same cage, unless they're over similar size AND well fed.

Many people who encounter snakes on their properties aren’t always sure if they are venomous or not. It is advisable to call a professional snake catcher just to be on the safe side. If you live in Noosa, the hinterland or surrounding areas, the person to call is local snake catcher Luke Huntley.

While it is true that most encounters involve non-venomous snakes, you should never assume that the snake on your property is non-venomous. You’ll be gambling with your life and the lives of your family members if you try to remove the snake on your own.
https://snakecatchernoosa.com.au/