Thank you for your answers
Just to clear things up, I used Electrum as Software and created the watch-only with the master public key as described in the Electrum docs.

I am fairly new to Bitcoin and recently I created a cold wallet using Tails on an USB-Stick. To see the history of my transactions, I created a watch-only wallet on my online machine. Now I have two questions:

1. If I want to transfer Bitcoin to my cold wallet, it is enough to create a recieve request in the watch-only wallet and send it to the adress generated by this request?
2. Is it possible to create multiple watch-only wallets on different machines for the same cold wallet?