Price Doctype with Different Weight wise slab

I have created a Doctype related to prices the base currency as PKR and the prices in USD. At that time, I forgot to handle the multi-currency issue. How can handle this in doctyype prices must be in USD
Thanks in advance

Any body know about this solution or way

it is same like sales invoice standard when we select USD in Child table all prices convert into USD

Can i Manage in Standard/Functionally?