Thank you very much TIG for the prompt and in depth reply.

There is a lot of info to digest and I will try it out.

Thank you again.

I've just started coding in ruby for sketchup and this forum really rock on helping me getting started.

I wanted to created a line, name it, set attribute to it and be able to return to that particular line ( I mean selecting it) by stating its name in ruby script after sketchup is re-started. Do I need to make the line into group or component in order to do it ?

Can I export the entity name ( in this case a line) and its attribute to a file (a csv or database file) ? If database can be used, what type of database ? Can I use MySQL and how do I read the database file into sketchup ?

Thanks guys for all the help in this forum.