1. Click > . The Calculate Chain’s Center dialog box opens.
◦ ![](../PDX/images/pdx_analysis_button_select_chain.gif)
—Select a chain of curves or edges.
◦ ![](../PDX/images/pdx_analysis_button_select_line.gif)
—Select individual curves or edges.
◦ ![](../PDX/images/pdx_analysis_button_clear_chain.gif)
—Discard selected curves or edges.
◦ ![](../PDX/images/pdx_analysis_button_show_chain.gif)
—Highlight selected curves and edges.
4. Click
![](../PDX/images/pdx_analysis_button_calculate_line_center_point.gif)
to calculate the line center point.
5. Click
![](../PDX/images/pdx_analysis_button_add_line_center_point.gif)
to create the calculated line center point.