You may use multiple bank accounts, but we consolidate the data into just one.
When forecasting we focus on one bank account instead of multiple, as cash is cash and specifying which of multiple accounts may have the cash makes the cash flow statement very difficult to handle.
So we merge all bank accounts into the primary one when we import actuals so the flow looks right in your budgets. As your accounting software will represent the true balance sheet.
Budgyt is meant to help you forecast cash and it is easiest with just one bank cash account versus multiple. It is possible to import to the various bank accounts but the forecasting will only adjust the primary bank account and to get your total available cash on the cash flow statement won't be possible as Budgyt is programmed to solve for one primary bank account.