Can my sub agents in other countries see prices in their own currency and language when they log in to my portal?

Yes, in most cases that is possible, though how far it goes depends on your suppliers and your plan. A B2B portal can hold a display currency and a display language against each agent account, so when an agent in another country logs in, the search results, the quote and the invoice are shown the way that agent and their own walk in customers expect to see them.

The currency side works by keeping one base currency for your business and converting from it for display. Your markup and any commission rules are still applied in the background, so you are not giving away margin by showing a different currency. What you need to be clear about is where the conversion rate comes from and how often it refreshes, because a stale rate on a cheap fare can quietly eat your profit. Also check which currency you actually settle in with the supplier and which currency your agent pays you in, as those two are often not the same and the difference has to sit somewhere.

Language usually covers the portal itself, so the menus, buttons, forms and emails your agent sees can be translated. Supplier content is the honest limit here. Hotel descriptions, room names, fare rules and cancellation terms come straight from the airline or hotel system, and many suppliers only send that text in English. Some send a few languages, some send none, so you may end up with a translated portal carrying supplier text in its original language.

Before you promise anything to an overseas agent, ask which currencies and languages your plan includes, how the exchange rate is sourced and updated, and run one real booking through a test agent account in that country to see exactly what they see.