Deductions & credits

@zomboo I am not being rhetorical. I want to learn this form you. 

Hypothetically, say I do a new purchase of a primary home which has ADU and say same has 25% square footage. Does 1.163T allow me to do the following?

1. Set aside 27% of the debt for ADU and 73% for the Primary home
2. Pay off Primary home debt first  (debt allocated for primary home could be more than 750K, interest deduction for the same is a separate discussion)
3. Pay off debt on ADU only after primary home is paid off?