I've been tasked with creating bookends on the adjustable shelf with standards and brackets product. I have the bookends added in the parts list and have created a new custom prompt to write in a value. Similar to specifying depth, height, or width. I am having an issue connecting the new prompt box value to the actual size of the part I want to control. I am missing a step somewhere and am unsure how to connect the text box with the part height. Could anyone assist me? I can give more information if needed. The goal is to control the height of the bookends in the product prompts for the specific product.