I have created a new serial record in the catalog but that record is not searched at the time of new subscription to the serial.
Hi, this sounds more like a support request than a bug report. Usually if a record cannot be found, there is a problem with the search engine/indexing. Please ask on the mailing list (https://koha-community.org/support/koha-mailing-lists/) or drop into the Koha IRC channel for support (https://koha-community.org/get-involved/irc/). Make sure to include the version of your Koha installation, how you installed it and which search engine you are using (Zebra or Elasticsearch).