We'll need alot more information before we can answer your questions...
By "1 spot" do you mean Scanlist 1? If so, did you program anything into more than just Scanlist 1?
To enabled other scanlists, press the number key for that scanlist (0-9).
As far as erasing the old scanning lists - are you using a software package to program your scanner?
Each time you send programming to the scanner, the current memory is overwritten by the programming you send. If you have many things you want to scan loaded into the memory at the same time, you must put all of that programming into a single configuration and then push it to the radio.
More info:
Easier to Read Pro-651/652/106/197 - WS1040/1065 - PSR 500/600 Digital Scanner Manual