If the lines you want get from the csv is the top you and do it like you have but in the inputlookup use also the "max" and "start" arguments. If not, instead of appending via the inputkooup, try to use the append [subsearch] command to get the csv data, filter it and then appending it.
something like:
index="logmon_logs" |top useother=f limit=10 CHKOUTErrorMSG by _time|timechart count by CHKOUTErrorMSG| append [|inputlookup chkouterrorNew.csv | <whatever you want to filter>]| sort -_time | outputlookup chkouterrorNew.csv
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