If you have traded products that will fall within the scope of the audit then yes, you will need some system in place to show that these are handled in accordance with the requirements of 9.1/9.2/9.3.
You may not necessarily need additional procedures though. We do not do the traded goods module with our BRC Food audit as we have separate BRC Agents & Brokers certification - this has broadly similar requirements. We've found that for most of these it is entirely possible to encompass them within the main procedures used for BRC Food, so for example 9.1 may already all within your existing supplier approval system, or you may be able to make small modifications to it to include these within it.