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In Sketch™, you have the option to add User Defined Symbols to your Sketch™  Items. You can access the Symbols Tool Option by clicking on the Symbols Dropdown option in the Top Menu.

Adding a Symbol to a Sketch:

To add a Symbol to a Sketch, simply select the Symbol in the Symbol Dropdown and click where you would like to add the symbol. You have the option to resize the symbol once it is placed on the Sketch.