Do you run smaller supply lines from the larger supply line at each faucet or just run the larger supply line to the beginning of the smaller feeder lines?

Let's say your main supply trunk line is 3/4" copper and at the other end you have 3/8 supply tubs connected to the faucets. The 3/8 tube is going to regulate the volume and pressure at the faucet so you can step down to 1/2" where you tap into the trunk, staying at 3/4 is throwing money away and creates other complications like stop sizes.