Another type of rule you can create to classify incoming expenses is a Billing group rule.
If you need to make a rule to automatically divide an incoming expense across multiple offices, the easiest way is to do this using Billing groups.If you don't remember what a billing groups are, a Billing group is a selected group of your offices, with percentages next to each office. What the Billing group does is take the total of a bill, and look at the percentages next to each office... then it enters the bill and charges each office their fair share, according to the percentages.
Watch this video to see examples you can follow to create rules the use a billing group for expense allocation.