It's a simple task to move funds from one part of your Better Giving nonprofit account to another:
Log in
Access your nonprofit dashboard
Click 'Save' to move funds from your investment account to your savings account
Click 'Invest' to move funds form your savings account to your Investment account
Click 'withdraw' to have funds sent to your bank account
Then at the end of the month, your funds are moved. You can always choose to amend the amounts up until 24 hours before the end of the calendar month.
Here's a Better Giving Academy video showing the whole process.
By default, all donations are initially added to your savings account.
If you wish to change the default ratio, so that every donation is split to your needs, take a look at this article.