If you open console and type: help
You will get a complete list of available commands. This is what you are looking for:
importprivkey "bitcoreprivkey" ( "label" ) ( rescan )
Thanks, the help command will be useful.
I have one more question, I claimed BTX from the BTC address I was using at the time of the snapshot (there are no longer any BTC at that address). For the receiving address, I mistakenly entered the next available receiving address of the BTC wallet!
So now I'm wondering can I export the BTC private key of this address and import it into a BTX wallet?
Edit: Figured this out in case anyone has similar issues. I went to http://coinomi.com/recovery-phrase-tool.html and entered my BTC recovery phrase, it spits out the derived addresses along with corresponding private keys. I then just took the correct private key and used the importprivkey command to import it into the BTX wallet. Thanks for the pointer.