[Therion] Export EE as .3D and ignore "survey does not exist"

Hello, I have two questions: 1) Is it possible to export an extended elevation as a 3D file (like survex does)? For the purpose of 'debugging' the extends etc. 2) Is it possible to ignore "survey does not exist" errors? I.e. I have a file with all the extend commands in and I just want the relevant ones to be applied, even if I am just looking at a small section. Thanks for any help, Rhys