Agreed, I have contacted Support Twice to do this already but would have been great to do it myself as self service.
That said I originally moved all my US Shares into another Portfolio and used Consolidated view. However after watching a Reporting video I realised Im not a US Resident, I only need Tax Info based on the ATO Requirements, having in tow separate portfolios mean running multiple reports. So I asked Support to merge the two back together. Now I just run one set of reports for tax time.
So logically think about splitting thigs out, if your a dual citizen and have requirements to pay Tax for both then sure, otherwise having all in one is ok.
I do also see the benefit of splitting out say a SMSF.