Create Line on Part
Create a line that can later be used to generate seam welds.
- On the Project Tree, click on the Assembly workbench.
 - 
                In the Assembly workbench toolbar, click the 
 Create line on part) icon.
             - In the modeling window, click to choose points for the line.
 - Optional: Edit the coordinates of the points in the X, Y, and Z fields.
 - Click OK.