Exporting tracks

I can not get this to work.

I have the second part of the original recording on a separate track of its own.

I’ve set the L and R locators to before the beginning and after the end of the part (it’s about 1 hour long).

The track it is on is the only track highlighted - all other tracks a muted.

I select File/Export / selected Tracks/ [Copy].

It goes through the process but just seems to copy the entire original 2 hour recording!

I am not at all sure that the above is the right way to go - I just want to save half of the original recording as a separate .wav file. Is this possible?