Stefan You can already do that. It's just a few clicks more in the UI because it wants you to keep on saving until you reach your goal and not take out of it multiple times along the way.
If you want to take out any amount out of a Savings Goal:
- Go to Home, open the MENU, then choose Pay
- Enter the amount you want out of your Savings Goal
- Next choose the account that you want to transfer the money TO (this can be another one of your sub-accounts or an external account)
- On the last screen, before clicking on "Send payment", click on the originating account icon on the top left and choose your Savings Goal that you want to send the money FROM
Of course, this could be made easier, but afaik that's intentional design.