Cypress - how to have one code for every test case

Is in Cypress some sort of packages how can I have only one code for every test case I'm making?

For example: I have one same process of clicking through my website but I need to have like 20 test cases. This website is still upgrading so if there will be change of site I don't want to make changes in code for every test case but only on one place.

Thanks for your help.