I'm going to try this another way,
Riding a bike we are often faced with turning. We can do that two ways. Turn the handlebars, or lean the bike. At slower speeds turning the handlebars and in turn the front wheel is the primary way we create a turn. At speed we lean the bike and in turn create an arced contact patch with the ground. The tires interacting with the ground provides the off axis forces that compel us to turn in both scenarios.
Let's look a bit deeper at this and what we will find is that steering a ski and turning the handlebars are very similar in that the front wheel (or skis) turn before the rest of the bike (or body). Turning the handlebars is usually how we choose to turn a bike at lower speeds since leaning too far inside the turn will only cause us to fall over to the inside of the turn. In other words the balance axis is fairly vertical and exceeding that point causes us to fall, so we use a larger steering angle to make a slow short radius turn. The wheel and the frame of the bike are in a countered relationship much like the skis and the body would be in a slow short radius ski turn.
Leaning the bike and tipping the skis are also very similar in that the we ride the curved contact patch and the steering angle is much smaller. This method is used more frequently for higher speed and longer radius turns. In this example, If we didn't lean far enough into the turn then the bike would turn but we wouldn't, we would just fly off the bike to the outside of the turn. The greater point here is the balance axis isn't the same for turns of different size, shape and speed. So our tactics are different for all of these examples.
Which brings up a third and IMO the most important point, traction is important in all of these examples and it's a function of aligning the sum of the system of forces in play along the balance axis and through the contact patch SD and Rick called your Base of Support (BoS). If you're having trouble establishing and holding an edge, more than likely you are not aligned along the balance axis and correcting that first is the best advice I / we could give you. So with all sincerity I am telling you again to seek the advice of a coach who can work with you on the snow. All of these tangents about early edge, more activity early in the turn, don't address the fundamental need to establish balance first, then maintain it throughout the turn. For that you need a real world coach to work with you in person and on the snow. We can certainly help you understand many of the theoretical aspects of ski technique and we offer a unique blend of opinions from ski schools and race programs from around the world but we are a very poor substitute for on the snow coaching.