AutoCAD LT - total length of lines & polylines calculation

This video explains how to do the total calculation of all the lines and polylines in the given layer in AutoCAD LT. Because the Lite version is too limited, we must use other software. In the video, the QGIS has been used.
Learn more here:
www.astro-geo-...

[@leileijiang337]

I can't add a new field in the attribute table

[@mariuszkrukar950]

You need to export the layer to the GeoJSON or SHP first and then try to edit your attribute table.