In order to auto fill PIC, SIC, Night and other time durations, you need to specify for each aircraft type the fields that are to be auto filled. Which fields are the default, depend our your license type and job type.
Of course you can customize this in any way you like. If a duration field is not auto filled, there is a magic wand icon next to each duration field in flight edit, that still allows you to fill the field quickly.
Go to More --> Aircraft Types and create or modify an aircraft type to set the auto fill times.