Yes you can import watch only address. I am not sure what exactly is confusing you
I think the OP is asking how to import more addresses to an existing watch-only wallet.
To OP:In the desktop version, you can add more addresses to a watch-only wallet.
To do so, click on "Wallet" at top of the window and then select "Import addresses".
Note that if you have created the wallet using private key(s), you cannot import a watch-only address and you can only import private key(s).