Smart Contract Customization

Hello! I have a question for developers on the Ethereum Blockchain. I'm new developer on Ethereum and would like to know something about smart contracts: How customizable are smart contracts?

I'm thinking of an application based on NFT trading. Could I possibly write up a smart contract to have multiple people earn royalties from a single NFT?

Say Person A mints the NFT for Person B, is there a way for both of these people to gain royalties from future trades>