Weigh bowl and press Tare
Weigh flour and press %
Add salt for example up to the proper percentage then press Tare
Add yeast for example up to the proper percentage then press Tare
And so on...and the scale will still be using the 100% calculation from the original flour weighing.
I would just press tare after pressing the percent button. That way you don't see 1xx%, but rather xx%. Otherwise you have the concept correct.
P.S. Also, Pete, I know your process generally calls for disolving salt in water, dispersing yeast into flour in a couple of steps. Any reason you couldn't just put all the ingredients into the bowl and mix/knead with the Kitchenaid? Sure would be more convenient and faster than adding steps as November noted.
I often dissolve the salt in my water, and being that you have to measure it at some point in the process, I'm not sure why you think it's an added step with regard to weighing. I always measure my salt, other dry powders or granulated substances (e.g. sugars, milk, if I use any), and yeast separate from my flour because I intend to dissolve them directly in my water. So I dedicate a small cup for weighing all of my solutes, making my percent based weighing procedure look like the following (tare after steps 1-5):
1) Weigh the flour in a mixing vessel and press the percent button
2) Place a borosilicate glass container on the scale
3) Weigh the water then microwave it to the desired temperature
4) Place the cup on the scale
5) Weigh each solute except the ADY to the desired percentage
6) Add solutes (no ADY) to the water to dissolve completely
7) Measure ADY volumetrically and add to solution
8) After ADY is dissolved add solution to the flour and mix
On step three I actually heat the water to just beyond the desired temperature with a little more water than ultimately desired, so that the water will undergo evaporative cooling while I am measuring the rest of the ingredients, and bring the quantity and temperature of the water down to the desired levels when I'm ready to mix the solution in with the flour.