$FN_OUTPUT          = "$DST_DIR/XXX_SIPABCD_5MIN_OHR_${YYYYmmddHHMMSS}_${INSTANCE}_$$";         # Suffixes added later: .processing .completed

##</code><code>##

my $vmstr = "zldcdyh1bdce2d14-xxx-vccpohr-correlator-0";
my ($opstr) = $vmstr =~ /-(\d\d)$/;    #using the value of $vmstr of the VM but with an added 0

my $OPinst = “/PMOSS_SIPNBVQM_5MIN_OHDR_${YYYYmmddHHMMSS}ss”;

But I am not sure how to use the $opstr in 

$FN_OUTPUT          = "$DST_DIR/XXX_SIPABCD_5MIN_OHR_${YYYYmmddHHMMSS}ss_${INSTANCE}_$$"; 

Is it as

$FN_OUTPUT          = "$DST_DIR/XXX_SIPABCD_5MIN_OHR_${YYYYmmddHHMMSS}$opstr_${INSTANCE}_$$";