Don't wonder to much, let's make it simple: Send 5 AMP and 0.1 BTC to an Electrum address - this is safe, you will only see 0.1BTC. Now import private key of that Electrum address to Omniwallet, you will see 5 AMP and 0.1BTC. Then you can send that 5 AMP and 0.1BTC to your main wallets.
Thanks for your help!

I already sent 4 AMP and 0.01BTC to an Electrum wallet.
If I check my balance on the electrum wallet on the welcome page, I can see the 4AMP and 0.01BTC, but...
When I am inside my Omniwallet and I created a new address with the private key of the Electrum address I can not see any BTC or AMP... what I am doing wrong??
My head is gonna exploded!!
the problem is your mind, you gonna get crazy. You will never see any AMP at Electrum wallet - that is for sure.