Hello everyone - I am starting a new cave map project and trying to apply some stuff I learned a few weeks ago. I am not getting what I want, and I think it is because I do not understand the scope of select and unselect in a thconfig file. Reading the Therion Book - page 50 - It appears that "select" is not processed sequentially. It has the same effect no matter where it appears in a thconfig file. Is that correct? And if that is correct, then what purpose is served by "unselect"? What I want is a variety of exported maps showing only the drawn parts of the cave. Then I want a map which shows all drawn parts AND all centerline. I defined several maps and surveys in the .th file to cover this. However, when I do the compile it acts like BOTH sets of defined maps are exported. My thconfig file looks like this: source main.th # repeated for all the layouts I want to use layout endlayout # produce the basic maps select MainMap export ... export ... # produce the debug map unselect MainMap select MainMap-Debug export ... Thanks! -- =============== Bill Gee