How to track actual scrap variance during production

What is the purpose of setting up 'scrap account' in the production paramer and as well during production end.

My intention is, i need to track the actual material scrap during production process.

For ex:

my FG is 'T-Shirt'

Raw material is 2 mtr of cloth.

But if the material is consumed only 1.5 mts and rest of 0.5 mt is my scrap means [we can use picking list journal to specify consumed qty is 2 mts and scrap is 0.5 mt]

After production end, The costing will be calcuated based on 2 mtrs only, that is absolutly correct.

But how can i track that 0.5 mts as scrap in the posted ledger transactions.? Is that 'Scrap Account' in the production end process will help to show my actual and scrap variance?

Please share your input.

Thanks,

Prabu S