More than one UOM

Hi experts.

My company stores and sells maize seed packaged in different sizes

eg Bales (12 x 2 kgs), Bales ( 24x 1 kgs), Bags (5 kgs), Bags (10 kgs) etc

Do I have to set different items with the above packages or how can i set the inventory so as to be able to produce a report showing the quantity of seed per package type?