Multiple scan sessions some bad anatomicals

Hi there,

If I have a participant with 2 scan sessions (a few weeks apart). One of the anatomicals is unusable. What is the best way to run it with fmriprep?
Is there good way of utilizing anat from one session to save the funcs from another?
How would fmriprep behave if one of the sessions is just missing the anatomical because I deleted it?
In general, is there a recommended way of dealing with rejected data?

Thanks,
nir