You can list output of all policies and save to a text file, then search the text file for this:
'Residence is Storage Lifecycle Policy'
/usr/openv/netbackup/bin/admincmd/bppllist -allpolicies -U >/tmp/policies.txt
If SLP is defined in policy Attributes, the entry will look like this:
Residence is Storage Lifecycle Policy: yes
If SLP is defined in policy Schedule, the entry will look like this:
Residence is Storage Lifecycle Policy: 1
You can also extract this details through Activity Monitor (Java Console) as well or you can follow what @Marianne suggested.
Log on to Java Console => NetBackup Management => Policies
1. If SLP is defined in policies : Select Summary of All Policies -> "Storage" Column will show you the SLP's corresponding to your policy. Go to File -> Export - if you want to export the details to file or you can try just copying from console
2. If SLP is defined in Schedule : Expand Summary of All Policies -> Select Schedules -> "Storage" column will show your SLP's. Export to file or copy as explained in point 1