I can't import my secondary account on Mestamask that has been linked to Trezor. Can someone help me?

I have a main account on metamask and I created a secondary account inside it to link with trezor and save the NFT’s to be traded on OpenSea. However, when I try to import it, it doesn’t work. I have the public address of the secondary wallet, as it has no seed, as it is inside the main account. Can anyone help me?