Symbols
Put simply, symbols are objects that affect other objects. Symbols are especially useful when you have a lot of repeating objects or elements in your project, and you want to have the flexibility to be able to make edits or updates to those objects all at once. The Symbols panel allows you to change one symbol, such as scaling or changing its color, and all of its symbol instances will get updated to reflect that change.
Creating symbols
To create a symbol, you will need to have the Symbols panel onscreen. Go to VIEW | STUDIO | SYMBOLS to make the Symbols panel appear. As far as I can tell, using the Symbols panel is currently the only way to create a symbol. On the Symbols panel there are three buttons, Create, Detach, and Sync, which we will discuss in detail in the following visual examples:
Once you have the Symbols panel onscreen, select the object you want to become a symbol and click the Create button...