I am new to the 8200 so not really sure but in reading the manual you can delete a single channel by selecting it in the memory mode and keying the delete button. You can use the pass button while it is paused on a channel- probably the one you do not want and it will stay in the pass mode for that channel or frequency until you go back in and "un-select" it.
Or you can just hit the scan key to move it along instead of using the pass key. I believe it is all on page 64 of the manual.