Thank you for your help Francois. Yes, totally makes sense.
The reason why I was looking for an alternative to the copy paste is that I have many "conditions" (~20), with each condition folder containing an head model, each head model is ~100 MB. With 20 conditions * 30 subjects I end up with several GB of head models. Not a big issue but still if there was a way to tell to the function process_inverse_2018 that the head model you want to use is not the one in the same folder but one in another folder, this could be avoided (one head model could be used for several conditions with no copy paste).
On a minor, though related, note I could not find a way to script the copy paste of the head model in the different folders. Is manually the only way?
Thank you in advance!