There is more than one address in a wallet. We can receive different payments using these addresses. But all the pays are in the same wallet. When we make an address payment, we will send our through which address.

For example, MyWallet is my purse. I have my A, B, C, D addresses in this wallet.

A: 0.2 BTC
B: 0.1 BTC
C: 0.7 BTC
D: 0 BTC

MyWallet: 1 BTC

I want to send the address bitcoin to D. Now when I write address D in my wallet, 0.5 BTC will be sent from which address.