Linking an address from mileage to the customer's profile is currently unavailable. This is because in mileage, you will need to add the starting and end point addresses. While on the customer's profile, you will need to enter a fixed address.
For more details about the feature, you can read these articles:
it strikes me that if I am attending regular customers linking the address would save time
right now I have to review every single address which is an incredible waste of my time
i agree a trip to the shops would not be something automatic but regular customer addresses should automatically come up with the customers name and be listed as business
when will you be finishing the full integration ???