See also: How to Add Multiple Google Account via Gmail Apps on Samsung Galaxy S3
Once you've added another Google account, then you'll be able to use each of them to access and using another Google services, such as Youtube, Google Play Store, etc. You'll also be able to determine which the account you wish to use when you want to download and install apps from the Play Store.
How to switch Gmail accounts on the Play Store apps?
Here are the complete steps to do so:
- Go to Apps through the Home screen.
- Scroll to Play Store, then tap it.
- Tap the Menu key.
- On pop up menu select Accounts.
- Now you'll see all the added Gmail accounts that you can choose one of them you wish to use.
By knowing how to change the Gmail account on the Play Store apps, now you can determine which one you like to use to download the contents. This also will useful if you want to separate your purchases for any purpose.