Yes, this is exactly what I used to do. The question at the beginning was related to the fact that for those subjects in which I did not have the FreeSurfer anatomy folder I wanted to check the source grid from the volume source model generated on the entire "cortex_cereb" surface, like this example:
But without this type of "cortex_cereb" surface set as default in the anatomy, I was not able to do it.
Thank you again for your help.