Custom contours are the contours at a given elevations other than the contour value which is multiple of the contour interval.
This custom contour can be generated using the menu option 'Custom Contours'
menu in ESurvey CADD interface.
If a contour line at an elevation of 477.23 is required, then create a record for such contour by clicking on the 'New'
button and entering the value. 'Save'
If you generate contour maps by clicking on 'View'
button, then you can observe that all such contours are generated along with other regular contour lines.