Normally, sweeping means to move the whole funds from wallets like paper wallet by proving the private key. Assuming, you have paper wallet, and you want to sweep to Wallet A. First of all, wallet A will have the sweeping feature, and it will request for private key of the paper wallet. Once you input the private key, the whole funds will be moved to the new wallet (wallet A). But, this is just a way you will have to just get your bitcoin to be handled by private key that will be online.

But what is explained above, you can send any amount of bitcoin you want (you can send half, you can send all, you can send less than half, or any amount), and yet your paper wallet private key is still offline, and yet the private key of the wallet you send it to is also offline. Nothing about your private key touch online. That is why I will strongly recommend the method.