Power steering hoses are made to withstand very high hydraulic pressures.
They are assembled with equipment made to do that which is impractical for a home-owner or even most shops to buy.
Your only two options in your case are either to buy a replacement hose (pre assembled) or to have a specialty shop (usually large machine shops that do work for heavy equipment or farm vehicles offer that service) make you a new hose.
Anything you try at home will quickly blow apart.