No. A business visitor may negotiate, sign documents and arrange for the venture, but may not perform productive work such as installing equipment or serving customers. The enterprise should also be real and operating, or close to it, when the application is decided.
Setting up is permitted; working is not
Hypothetical example: Zoe intends to lease premises in the United States and spend two months personally installing benches and wiring before applying, entering as a visitor in the meantime. The instinct is understandable, because the category expects a real and operating enterprise rather than an idea, and an empty unit looks unconvincing. The line, though, is between arranging and doing.
Negotiating the lease, meeting suppliers, hiring a contractor and opening accounts are activities a business visitor may undertake. Performing the fit-out herself, or opening the doors and taking orders, is productive labour that her status would not permit, and it puts every later application at risk. The better sequence is to commit funds under escrow, engage contractors to carry out the work, document the spending, and apply on the strength of a business that is demonstrably close to opening.
It is also worth remembering, when planning a decade rather than a season, that this status has no direct path to permanent residence.