Is there a way to account for shipping with UPS integration where two items that ship together would take up less space than the sum of the dimensions of those two items? I am looking to have netsuite calculate the real time UPS shipping rate, but the items can "nest" within each other, so adding a second item adds weight but only slightly change the dimensions of the package, so the rate is inaccurate. Has anyone ever encountered this or would my only option be to do shipping outside of netsuite and enter the rate manually?