Since you are claiming the roof replacement as a whole house improvement, you will enter the depreciation for that improvement under each Home Office section.
As you go through the Home Office section to enter expenses you should see a question about whether you made any improvements, either to just the home office or to the whole home. You would enter the cost of the roof as a whole home improvement. Then, the percentage of business use for that particular home office that you are entering will be applied to the total cost of the roof replacement.
Since you have four home offices, you will do this four times, entering the total cost of the roof replacement each time. TurboTax will do the math to apply the appropriate business percentage. Also, be aware that you must be using actual expenses for the home offices, not the simplified method.
@waveromper
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