Hi, FreeSurfer expert

I am having difficulty finding the functions that transfer an annotation file I generated on a template to each subject. This template has been registered with several subjects using a surface-based registration method. Now what I want is to (1)  transfer this annotation file from the template to each subject, through surface-based registration. and then (2) transfer the annotation file in each subject's surface to their T1 volume space.

Could someone show me which functions I need to use? Do I have to convert the annotation files first to label files to do that?

Many thanks in advance

Leon