internet expenses - audit

Hello

I am new to the audit setup in iexpenses

and was wondering if the following was possible

eg for flights, the user normally needs to take non first class, non business , but just economic

--> can we setup an audit for eg if the expense report contains as ticket: business , first class

or woudl this just follow eg the flow

--> get a warning and then , i would eg need to audit ALL the reports with a policy violation

even if this would be for eg publications or entertainment or hotel or ....

hope you understand what i am trying to say...