Hi,
You can use range notation to first define range for the column in the book. You can include book, sheet etc name so that book does not have to be the active window. So you can use code such as this:
range ry=[book1]sheet1!col(b);
ry(205)=;
You can refer to the LabTalk wiki, and this section in particular for interpolation:
http://wiki.originlab.com/~originla/ltwiki/index.php?title=Script:Interpolation
If you need more help please post in the LabTalk forum.
Easwar
OriginLab