Is it just to create a doc that you copy? Or do you package template somehow to make them findable by others?
Firstly: the templates under https://coda.io/templates are just a collection of docs which the coda team thinks might be interesting and/or useful for users - either due to them actually using the sheets or to look up certain functionalities. If you want to publish one of your own docs, just contact the coda team!
However, you probably have a sheet (e.g. for cooking recipes) and want to use a copy of it for something else (e.g. cocktail recipes)? In that case just go for the normal “copy” option. Unless when you have a link to a specific section of the sheet (i.e. the URL), it should get you what you need.