Bundle Builder is fully compatible with the Shopify Multi Currency system, this allows Merchants to sell their Bundles in multiple currencies, in different parts of the world, giving more flexibility to their customers.
Merchants will need to enable the currencies that they wish to offer on there store, using the following Shopify help guide:
Once that has been completed, and the currency selector has been enabled Merchants are ready to sell with other currencies.
Bundle Builder can't account for custom rounding profiles added in the Admin Space, only the currencies added and supported by Shopify.
Bundle Builder is also not compatible with Third Party currency conversion or switching App's.