Orders are created as Web Orders in your CRM. As default the name of the Web Order contains the date and the product with the highest price: PO-yyyy-mm-dd (highest priced product).
Change Order name
Create Auto Number field
- Go to: Setup → Object Manager → Web Orders → Fields & Relationships
- Click New and a create 'Auto Number' field in desired format
Create Process Builder
- Go to: Setup → Process Builder
- Click New and fill in required fields, the process starts on record change
- Select Web Order as Object and select 'When a record is created or edited'
- Create Criteria that updates on 'No criteria'
- Create Action type Update Records and choose 'Select the ordercentral__Web_Order__c record that started your process'
- Select the field 'Name' and update by Field Reference with the created Auto Number field
- Activate the process