When you create a wallet you get an endless number of addresses in Electrum. The seed, that you should copy and keep, gives you every time the same addresses.
If you want an other wallet you can create a new one or more, getting an other seed and getting new addresses.
You can save them in the same directory and use as many addresses as you want.
One seed creates one wallet with many addresses, you can't have two different wallets with the same seed.
I hope I've helped you.
Wallet =/= Address.
When you create a HD wallet (the one that has a seed), you already own more than 1 address. Every time you use your current address shown in the "Receive" tab, your wallet will give you a new one that is linked to the same wallet (keep in mind that all previous used address are still yours and can be reused). There is no need to create more than 1 wallet.
Just go to the "Addresses" tab (if it's not showing: View -> Show Addresses) and you will see every address your wallet has.