> man bastille-import
…
If the RELEASE argument is specified, Bastille will import the jail using that release.
**EXAMPLES**
Import myjail_DATE.txz:
> bastille import myjail_DATE.txz
Import myjail_DATE.gz under 15.0-RELEASE:
> bastille import myjail_DATE.txz 15.0-RELEASE
Import myjail_DATE.gz under 15.0-RELEASE from non-default location:
> bastille import /my/custom/folder/myjail_DATE.txz 15.0-RELEASE