One wallet with two address.
Name one 'Main' and the other one 'POS Savings' or 'POS for Spending'
Setup 'Savings' and uses your 'POS Savings' address to send POS into.
Use coin control to choose the 'POS Savings' when spending your coins
To turn on coin control from the menu selection choose 'Settings -> Options' Change to the 'display' tab. Click on the box that says 'Display Coin Control Feature'
Then when you go to send you will see a button called 'inputs' Click on 'inputs' and a screen will show all of you coins and the address they belong to. Choose the coins from the address that you want to send from.
this is very important to be clear, if is any tech difference or rule to have the savings address in the main wallet via coin control or setup another wallet to send there the POS rewards.
So far until now I was understanding that you should set up another address via "savings" for the POS rewards, I didn't catch that should be via coincontrol as mandatory and I'm not used to mess with coincontrol (this menu scares the shit out of me) so I did the second.
@GoldTiger69, is going to be necessary to make that clear in the Spanish OP
I'm pretty sure if you wanted you can use two wallets. Just setup them both up using different 'ports' and you can use two wallet on the same computer at the same time. Then have 1 address in each wallet. Have the savings from your 'Main' wallet sent to your 'Spending' wallet.