There is a concept of total daily dose (TDD) and the traditional way of managing this is to have 50% of your units as basal and 50% as bolus when on MDI.
Personally, I think you are better off determining your basal insulin on its own by doing a basal test and then working out what your insulin:carb ratio is and using this for meals.
It may or may not work out at the ratio you have been advised but it will be a lot more effective for managing your bg levels in the long run.