domi-nika

When traveling for work I have a couple of questions. If my usual place of work is A - travel from home to A is considered private milage. If my employer needs me to travel from home to another office location, would the entirety of the travel be considered business mileage? At the moment the company deducts from each travel to another office the usual distance we would travel to our permanent place of work so if it's 10 miles from my home to A then if i travel from home to B (another office which is not my parament place of work) they deduct the 10 miles.