Using styles

Styles are another useful way of maintaining consistency throughout your project.  Adobe Illustrator allows you to create and save different styles to use as part of a template. 
If the styles window is not already showing, choose Window → Graphic Styles from the menu bar.  To create a new style, first select all the attributes (stroke, fill, etc.) you would like the style to have.  This can be done using the appearance window.  When the attributes are as you like, click on the New Graphic Style button on the bottom of the style window.  The style is now available for you to use anywhere in your project.
To apply a style to an object, click on the object and choose the style you wish to apply from the style window.  Keep in mind that after you create an object using a style, any changes you make to that style will also be made to the objects you created.