Can we change our approval process reducing no of approvals

Can we change our approval process from: Requiistioner raises req, Budget Manager approves as per our hierarchy, thi sgoes into Autocreate. our central buyers review and create po and approve so it is sent out to suppllier.  reqs are raised through webbrowser.  we do not have AME. we want the requisitioner to raise the req, th ebudget manager to apprive and turn into a po ie cutting out the central buyer - for all req with a vlaue of £1000 or less, Any advice appreciated thanks Sally