In QGIS

1. put the vector in editing mode, select all the features and in the editing toolbar use the "merge features" tool

2. the dynamic segmentation plugin should do the trick ( https://wiki.faunalia.it/dokuwiki/doku.php/qgis/lrs )

In QGIS

1. put the vector in editing mode, select all the features and in the editing toolbar use the "merge features" tool

2. the dynamic segmentation plugin should do the trick