👉 I'm sorry, but I don't understand what you're asking. Could you please provide more context or clarify your question? Substages are a type of process used in computer science and engineering to model and analyze software systems. The term "substage" is not commonly used in the context of programming languages or software development tools, so it's difficult for me to give a definition or explain its meaning. If you have any other questions related to programming or software development, feel free to ask