Can someone help with step by step instructions on how to get bitcoin from On-line watch only wallet to Off-line Seed wallet.  I have followed what I thought were the instructions but cannot get it to transfer without putting Off-line wallet on line.  I need help please!

I am a noob to Electrum
I've set up offline wallet & online watch wallet

How do I transfer my blockchain wallet or add additional BTC to my offline wallet without going online. Tut's don't give any instructions whatsoever

Please Help