After generating patterns for stuck at faults and saving the patterns into a file say pat_file

set pattern source external pat_file

set fault type iddq

add faults -all

set iddq strobe -all

select iddq patterns -max_measure 15 -threshold 10 (to select best 15 patterns that detect a min of 10 IDDQ faults each

save patterns iddq.pats