Pairings like that, for example BTC/USDT, BTC/ETH, BTC/GTP or all existing pairings are usually used for trading or comparing conversions from BTC to other coins. So, if you have made a purchase, whether with any pairing and the purchase has been successful, all you have to do is send your BTC, no matter what it was at the time of purchase, it doesn't matter. But make sure that the purchase is successful. Try checking in your wallet to see if BTC is available. If so, just withdraw your BTC coins as usual to another exchange. Anyway, make sure that you check the destination wallet and also the network used. because this is really important, if it's wrong, you might lose your BTC. Understand first about Bitcoin trading, wallet, exchange, how to deposit, and also how to expand.