I'm wondering if when adding another transaction log file, if the DB needs to be detached in order to remove that file. Or rather, what do you have to do in order to reduce the number of transaction log files..?
I am not sure what you are trying to do. Are you looking to move a logfile from one place to another? Hopefully from one physical drive to another?
Anyway, you can remove a logfile, so long aas you have at least one left. You can never have a database with no logfiles. Look up dbcc shrinkfile (fileid, 'emptyfile') in books online. That should be enough to get you started, anyway. If not, let us know.