As you are entering information for each of your home offices, you would calculate the percentage for each using both the number of months the office was used and the percent of time you spend conducting business in the office. So, for your example, you spend 75% of time doing business in your office and you used the first office for 2 months, so your percent for the first office would be (0.75 x (2/12)) or 12.5%.
It is appropriate that business expenses not related to the home office are entered directly on the Schedule C. Those expenses are then prorated according to which office was being used when they were incurred so that the home office deduction limitation (if any) can be calculated.
The following TurboTax help article will better explain how to allocate and enter information for two home offices used during the year:
How do I allocate expenses for two home offices?
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