There is no method to tell TurboTax to handle this situation with two different dates.
Based on the situation, the expenses incurred, and the work that was done before the business 'opened its door', you will need to decide if the costs incurred between March and October were truly start-up costs for the business or if the business actually started in March.
If you consider October to be the date that the business started, then up to that point, there was not a qualified home office since the business did not exist until October. Home office expenses cannot be considered start-up costs.
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