הכנה לחול (Preparations for a Weekday): Doing an Action and Using Only Part of the Outcome. Doing an Act on Shabbos Simply to Save...
(Melting ice.) placing water or juice into the freezer; making ice cubes;
What Should One Do if They Need to Comb Their Hair for Halachic Reasons? On Rubbing One's Eyes, Nose, and Other Parts;