Can anyone help with the Tax Setup that is needed to apply Tax on Purcahse Requisition ?

Summary:

We need the details by which we can enable Tax on Purchase Requsition level, and the Requester will selct the TAX classification code at PR itself.

Content (required):

We need the details by which we can enable Tax on Purchase Requsition level, and the Requester will selct the TAX classification code at PR itself.

Version (include the version you are using, if applicable): 23 A

Code Snippet (add any code snippets that support your topic, if applicable):