While we are using negotiated prices of UPS.
In admin we have an option to enter the maximum Weight for UPS.
which is good.
But I have a issue hear.
lets say i gave 150 lbs as maximum size for UPS negotiated rates.
When customer adds Products in shopping cart, and if reaches any thing above 150 lbs.

Cart is not calculating the shipping and gives a message showing call for Shipping cost.

why is it not considering anything above as a second box. ie., if shopping cart has products weight 190 lbs the cart should count it as 1 box of 150 lbs and 2nd box of 40 lbs and give the shipping rates.

How can we achieve it.

can one help me with this.

thanks