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NB: this only tested with your sample.

awk 'BEGIN{c=1}
/^AAA.+nmon_aix53#/ {print > "file"c }
/^ZZZZ/,/^BBBP.+ending vmstat -v#/{
if ($0~/^BBBP/){c=c+1;print >"file"c;next}...

awk 'NR==5 || NR==9' "file"

if you want a range

awk 'NR>=5&&NR<=9' "file"