Choose Home tab→Clipboard group→Copy to Library.
Click on the elements to define the symbol, then click the Accept (check mark) button on the command bar.
On the command bar, in the Name box, type a name for the symbol.
Click to define an origin point for the symbol.
Tip:
When you use the Copy to Library command to create a symbol, a copy of the graphics is used to create the symbol.
You can also create a symbol by dragging and dropping the graphics you want into the Library tab. When you create a symbol using this method, the original graphics are used to create the symbol, and Solid Edge defines the name and origin.