If I understood the question correctly, it seems very similar to updating a KV Store as described in https://dev.splunk.com/enterprise/docs/developapps/manageknowledge/kvstore/uselookupswithkvstore/, but with multiple entries at once. So, instead of:    | inputlookup csvcoll_lookup | search _key=544948df3ec32d7a4c1d9755 | eval CustName="Marge Simpson" | eval CustCity="Springfield" | outputlookup csvcoll_lookup append=True   try something like:    | inputlookup csvcoll_lookup | where _key IN("544948df3ec32d7a4c1d9755","544948df3ec32d7a4c1d9756","544948df3ec32d7a4c1d9757") | eval CustName="Marge Simpson" | eval CustCity="Springfield" | outputlookup csvcoll_lookup append=True     The critical difference is "| where _key IN" to list the keys you want to manipulate instead of searching for a single one.       EDIT: sorry, I replied to the reply instead of the OP. Removed original and posted correctly. ... View more