As long as all the measurements are in grams, you can scale down or up. Baker’s percent in based on grams. Depending on your local humidity you might have to make slight adjustments.
Halving ingredients is actually a pretty simple rule of thumb. Just make sure to keep the ratios the same - so if the recipe calls for 5 cups of flour, halve it to 2.5 cups if you want to make half the amount of bread. Hope this helps!