Bill Format GST India

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Hi,
So GST is being introduced in India and we have to change the bill formats accordingly.

Can anyone please help me how I can do this?

I need a different format for Outside India sales and a different format for Inside India sales.

Also I am using the WooCommerce PDF Invoices Plugin along with the default WooCommerce Emails.

Apart from the invoices and emails, the products also need a custom field the mentions their HSN code which should also appear in the Bill/Invoice.

Can anyone please help with this?

Thanks