Any recommendations on creating portfolios? Should I be creating them by my brokers, trading currency or tax entity?
By the tax entity. You can have multiple brokers and currency linked to the one entity. For example for my SMSF I use a different broker for International and domestic shares but I need report for tax by the entity. You can combine the entities (up to 3 on the plan I am on) to get an overall picture of you total returns.
Defiantly by tax entity. You may also want to do it by broker if you use the cash accounts feature (since the automatic import of trades & dividends can’t be separated by broker), and then set up a consolidated view for each tax entity.