Vitamins and minerals have RDA (recommended daily allowance) targets set by the USDA … Huel meets or beats those.
The macronutrients (fat, carb, protein) are in ratios that the Huel team thinks is best for long-term health. There are no RDA values established for macronutrients.
You can use a calorie calculator to determine your daily calorie intake to maintain, gain or lose weight and then tailor your Huel mixing to hit that, allowing for non-Huel meals you eat as well. If (for example) you were looking for 2000 calories a day and were going to use 100% Huel then you would be consuming 66g fat, 151g net carbs and 148g protein.
If you add anything to Huel other than water all the numbers change.
Hope the info helps answer what you are asking!