The task appears to involve the following steps.
Employees manually roll a rack of product over to the transfer area.
At the transfer area product is removed from the supply rack and placed on order racks as per the specifications of the order sheet. Employees lift an entire stack of five boxes of product when moving it from rack to rack. This involves as few as one stack of five boxes up to as many as four stacks of five boxes at a time. The top shelf of the racks is well above head height and a two step ladder is used to gain access to the upper most shelves. It is assumed that the employee performs this task for a full eight hour shift with the standard fifteen minute break in the morning and afternoon and a half hour break for lunch.