Audit rules by expense type

Summary

Where to find setup information for setup of audit rules by expense type

Content

Looking for information on how to setup an audit rule by expense type; such as an expense type of materials that is housed in a template with other expense types--rule ER over a dollar limit.  Also, would this require a role different from entering the other defining expense categories, such as Expense Report Audit Selection Rule, and if so, what is the logic for a different role?

Version

20B in Test