Does anyone know how I can get only the subsidiaries directly selected on the account in an Account saved search in NetSuite, without getting all child subsidiaries when the “Include Children” box is checked?

Looks like you can do that with an Analytics Workbook rather than a search. For any info pulling from GL Accounts, I'd always use Analytics Workbooks. There are weird gaps and limitations with pulling info from GL accounts via Saved Search that have mostly been corrected in the AW. If you absolutely have to use a search, I don't know if that's possible.

@RJMNS i tried with workbook, couldn't able to find the rite field. its was also showing the subsidiaries with children.

Not sure then. Only other way is maybe by using some SuiteQL and/or pulling from your data warehouse if you have your data going into one.