Hi! Is there a way to manually override the minimum order value for a SuiteCommerce website and replace it with a custom logic? For example, if a customer has placed one order for $150 (Current Minimum Order Value) and later during the same day, he/she needs to add something else, the total for which is less than $150.

Not as far as I'm aware as it checks it at the point of order. Your customer would need to cancel the order or contact a service rep and have them modify the order.