I have a hard time describing ski technique and often hit delete instead of submit, but I'm going to take a stab at this one at the risk of sounding a little........less than articulate. Well, this is more of a question than an answer......
Are you talking about the type of skiing where you have a "Tigger" sensation. Almost like you're skiing two footed but on one spring tail (this is where I have a hard time describing what I'm really getting at)
When I learned to ski powder which was a bit brutal under the surface especially when using the technique that I'd been learning so well on the groomers(The powering or carving turn), someone suggested that I get the feeling of Tigger and think bouncy trounce flouncy, fun fun fun fun fun. Tigger never really quite touches the ground with any pressure.
Is this the sort of thing you're getting at?
Hi, TC. I hate to admit this, but somehow there was a giant hole in my childhood reading list. I basically had no idea that Winnie the Pooh even existed until the Nitty Gritty Dirt Band did a song about him. Hence, I'm not too sure about the Tigger reference.
Nevertheless, I *think* what you're describing is similar to what many here are saying. The two-footed thing is key, but I'm not sure how to interpret the "one spring tail" as I don't know the reference. All of what comes next is just how *I* think of how to ski lightly.
Back to the two-footed concept, the idea is to spread your weight as evenly as possible over every bit of surface area provided by the bases of the two skis. Loading one ski more than the other will cause that ski to drop into the snow surface more deeply and that runs more risk of hitting things. Equal weighting is the goal through the phases of the turn between initiation of one turn and initiation of the next.
As to HOW to initiate the turn, a lot of good advice has already been given here. You can't do an "active" extension or traditional up-unweighting move without applying too much pressure to the skis in that up move. You CAN do a retraction or flex-to-release move to change edges and begin the turn as long as you gently and progressively reapply pressure to the newly-weighted skis.
The key at initiation is to move your body mass across the skis (and down the hill) with as little extra weight applied to the skis as possible. I think the PSIA exercise called "Falling Leaf" can be a great way to feel this. If you work on it, you can change the direction of your skis 180 degrees with continuous pressure on both skis and almost no up-or-down movement at all. Practice it on a moderately steepish groomed run and be very aware of eliminating any extra up-movement to get the turn started.
That "turn" can then evolve into a very "light" technique for changing direction and "floating" as softly as possible over obstructions.