There are two ways you can load money to your business account.
Bank transfer from any of your current bank account(s) to business account. For this you will need to add the business account as beneficiary on your banking portal. Business account number and IFSC is available on RazorpayX dashboard for the same.
If you are an existing Razorpay merchant, you can request support to change your current settlement account to to business account. Once processed, your Razorpay Payment Gateway funds will start getting settled to your business account.