Importing an address makes the client import the address directly, without doing anything to it. When you want to spend the coins, the inputs would be from the imported address and the change will be sent back to the origin. You need to make a backup of your own private key.
Thank you very mach.
Did I have have to make transaction from sweeping address to one address in my wallet or Elektrum make this transaction automatically.
Thanks again
Can I use several keys in one sweep or I have to sweep them one by one.
Did this transaction propagated to network with fee and wait confirmation or it is inside to the client.