I think the best self solve is to go into your business home expenses (under transaction type all, scroll to business spending - Business Use of Home).  "Select all" with the top checkbox and time frame and "Edit Category" to change to "Other Busines Expenses" which shows up on the last line of your tax summary.  Then create a rule to determine which percentage is right for your office use which is usually about 10% for office use. Good Luck!