@KevinJ of Kansas For the Parent Subtab selection, I agree - I've definitely selected custom subtabs there in the past. But the order they show up in (at least on transactions) isn't modifiable and, as far as I can tell, a mystery in terms of how NetSuite determines the order. And it has to appear on the same subtab for all Transaction types, since Lists aren't an option in the Move Elements Between Subtabs page for Transactions.