using what's now maybes classed as the more 'trad' method you align knees, hips, shoulders to echo the slope (uphill or downhill) with this the ball position will be nearer to the higher foot in the stance.
on stance be a ways careful you don't fall foul of rule (usga) 13 in general & 13.3 in particular.
"13-3. Building Stance
A player is entitled to place his feet firmly in taking his stance, but he must not build a stance."
steeper the slope the nearer to the face & lip you have to be a ways careful with this. as the sand moves ways easier.
with the uphill front slope in a bunker align yourself with the slope. ball off inside left heel. with the uphill slope as long as you swing upwards into couple inches behind the ball you'll get the elevation needed without opening the face, so square leading edge (you don't want really to be using a 60º you won't get the forwards travel) real steep slope you may want to go with a gap wedge - why practice/experimentation is key)
the ball will come out high anyways, land soft, so not a ways forwards travel.
you going to need a hands to shoulder height back, then square into couple inches behind the ball, as you, with this method, swinging up the slope as long as the bank face isn't in the ways you carry the swing through to shoulder height - if slope allows - that ways you'll get further than just out on the lip.
crucial to the motion that first off you keep your vertical head height with real steady head. keep the body turn motion well centered with weight into the lead leg - if you don't you'll fall back off the shot & skull it or whiff it.
if the slope is real steep the above the ways to go.
if not so steep you can use the more 'modern' ways of using the knees as shock absorbers to work little ways against the slope so the hips & shoulders are a ways more 'level'.
ball position nearer to mid stance. but as the uphill slope is still there you still want a squarer leading edge maybes still a gap wedge if any distance required.
still hands to shoulder height, strike couple inches back of ball position. but this motion won't give you too much of a follow through. the ball will come out still with height but will be hotter so good to use to a further flag.
but the 'newer' method more difficult to get down at first so needs practice work.
& if the ball up in the face of a real steep slope the first method is a ways easier to get a handle on.
