Hi @shibinsvk,
The configuration for paid search detection can be found in the settings for each Report Suite; so:
Admin > Report Suites > (select suite) > Edit Settings > General > Paid Search Detection
I am not sure how familiar you are with the tool (or for others finding this thread), these settings are also used for the Marketing Channel "Paid" and "Natural" search rules (instead of you needing to keep both this and Marketing Channels up to date with the same query string identifiers.
Here you can set rules for all "search engines", or set rules for specific Search Engines.
