Electrum has the tab receive, when I open the tab it creates an "address to receive" and gives the option to add description, quantity and the expiring time with the option to save it.
You can add description to any of your receiving address in Electrum, for example if you will get more then one transaction to one address just add description
"Payment from Bob", and you will see this description in Electrum history tab so you will know Bob is sending you coins.
Option
quantity is only for your info and it has something with
expiring time option. You can set amount of coins and expiring time so wallet will inform you if payment is not made. For example Bob need to pay you 0.02
BTC no later than December 25, 2019, and when you enter all data in receive tab, you do not need to worry that you will forget about this event.
I hope this information helps you better understand how Electrum works.