[Wien] how to cut a surface

[Fedor Bystrenko]

Hi,
Are there any utils in WIEN package for supercell creation? I'm interested not just to enlarge the unit cell, but also to rotate it and cut a surface along some direction.
For example, I take a unit cell of wurzite SiC and want to create a surface with [10-10] orientation. Another question is how to rotate a crystal cell to a given angle along one axis. Any advices/ papers/algorithms are appreciated.
Regards, 
Fedor Bystrenko