You can change equations in a linked text file and see the changes reflected in a part.
		
			To change equations using a linked text file:
		 
		- 
					At the bottom of the Equations dialog box, click Open linked file   from any view. from any view.The text file opens. 
- Change one or more of the equations.
- Save the text file.
- In the Equations dialog box, you can link and unlink individual equations by selecting and clearing the check boxes in the Links column.
- Click  Rebuild  to see the changed equations. to see the changed equations.