Hi Leonard, so if I understand you correctly you have a bunch of curves and you want to create tubular objects that follow those curves as the path?

Probably the fastest way to do that right now is to install the Pipe plugin from here:
http://kyticka.webzdarma.cz/3d/moi/#Pipe

That automates doing a sweep of a circle around a batch selected set of path curves.

The forum post about it is here:
http://moi3d.com/forum/index.php?webtag=MOI&msg=1463.9

- Michael