As production planner of Xianling hu Products, You have Loen given a bill of material for a bracket that is made up of a base two spring, and four clamps the base is assembled from one clamp and two housings. Each clamp has one handle and one casting. Each housing has two bearings & one shaft There is no inventory on hand.

$1.$ Design product structure noting the quantities of each item and show low level coding.

$2.$ Determine gross quantities needed of each item if you are to assemble $60$ brackets