You can move, scale, rotate, shear (or skew), or reflect symbol instances in the same way you can other objects. You can also perform any operation from the Transparency, Appearance, and Graphic Styles panels and apply any effect from the Effect menu. However, if you want to modify the individual components of a symbol instance, you must first expand it. Expanding breaks the link between the symbol and the symbol instance and converts the instance to regular artwork.
For videos on selecting and aligning objects, including symbols, see www.adobe.com/go/vid0034 and www.adobe.com/go/vid0035.
After you modify a symbol instance, you can redefine the original symbol in the Symbols panel. When you redefine a symbol, all existing symbol instances take on the new definition.
To replace the parent symbol with this edited version, Alt‑drag (Windows) or Option‑drag (Mac OS) the modified symbol on top of the old symbol in the Symbols panel. The symbol is replaced in the Symbols panel and is updated in the current file.
To create a new symbol with this edited version,
drag the modified symbol to the Symbols panel or click New Symbol in
the Symbols panel.
If you’ve scaled, rotated, sheared (or skewed), or reflected a symbol instance and you want to add more instances with exactly those same modifications, duplicate the modified instance.
Alt‑drag (Windows) or Option‑drag (Mac OS) the symbol instance to another location on the artboard.
Copy and paste the symbol instance.
Choose a new symbol from the Replace menu in the Control panel.
Select a new symbol in the Symbols panel, and choose Replace Symbol from the Symbols panel menu.