you cant. better find some dungy small apartment. unless you live in a home naked, and never eat or have no car or phone

Porting is for you if you get better rates in doing so. Porting is carrying over the contract to the new property. If you sell the current house with the equity and apply a new mortgage, you will be able to save on payments especially if the rates are lower now. You can then have a substantial down payment on the smaller house, have a lower rate mortgage and hopefull have some cash left.

Before the bank approves your mortgage they will look at your offer of purchase and also the bank requests listing printout from MLS system. If the deal is private they might request a home appraisal if the price is higher then normal for that area.