An inventory item can only have one unit of measure (called Unit Name).
However, you can define two inventory items for the same tea, one in bags and the other in kilograms. Use production orders to “produce” kilogram items from bag items. Manager will then track them separately. But it will not combine them. For example, let’s say you have 10 bags on hand. No report will show 10 bags and 800 kgs, because that would be double-counting your inventory.
Inventory kits won’t work because you don’t stock inventory kits. They are for things you stock separately but often (though not always) sell together. For example, you stock glass jars and metal lids. Customers can buy them separately, or they can buy a jar/lid kit. Kits are “assembled” only when fulfilling an order. Otherwise, the components remain separate.