You can NOT even change each one individually. You DO NOT need to worry about the measurements for all boxes since the others will change automatically so that it stays in proportion. lol You will ONLY be plcing measurements in ONE of the boxes. I didn't make the program ), Width and Depth.
Height (although it says Hight, it's the same thing, just misspelled, don't know why, don't ask. You can clearly see that there are 3 boxes and each contain a box to put YOUR measurement in.
