Save Procedure Chunks

I'm making a mod involves being able to unlock specific chests with specific keys. The procedures for all the different chests are going to be the same except for which key to use. It would be tedious to have to constantly write the same code over and over again, so I feel that a good feature would be to be able to copy/paste or save entire chunks of procedures. What do you think?

Also, thanks in advance for any response.