Yes, in Power Apps, you can declare and reuse values, formulas, or expressions across your app by using variables or collections. However, Power Apps does not support declaring reusable syntax or formulas directly as variables (like in traditional programming languages). Instead, you can achieve reusability through the following methods: Global Variables Use the Set function to declare a global variable that can be reused across screens. Example: Set(varGreeting, "Hello, World!"); You can then use varGreeting anywhere in your app to reference the value.