#Batch Job - AB1234
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#--------

awk '/#Batch Job.*AB1234/,/#--.*/' filename

BATCHJOBNAME=AB1234
awk -v batchjobname=$BATCHJOBNAME '
  /#Batch.*/ { f=1 ; m=0 ; res="" }
  f { res = res $0 ORS }
  f && /Job.*/ && index($2,batchjobname) > 0 { m=1 ;}
  /<#--.*>/ { f=0 ; if (m) print res ; }
 ' filename