Tubotax only allows you to add two home offices. If you want to enter just two of them, you will be asked in the home office section to indicate that you had offices in more that one home during the year. You just need to click on that option and follow the instructions.
If you want to manually calculate the allowable deductions for the third home office, you can enter them as expenses that are "for the home office only." You will see that option in the home office entry screen on the page after you enter the expenses that are for the "entire home."
To manually calculate the expenses for the third office, take each home expense (rent, repairs, insurance, etc) and multiply them by the percentage size of the home office in relation to the size of the home, and then multiply that amount by the percentage of business transacted from the home office.
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