Hi,

By default in the Portal under the My Account You can see Sale Orders, here the confirmed quotations(sale order) is shown.

To display the quotations either you can add a new page like the Sale Orders or edit the controller of the current sale order page in the Portal. In the code you can check for the route with my/orders , inside this route the records with the confirm state may get filtered, You can make the necessary changes inside this controller to display the quotations too.

Thanks