Here's how you can do that: 

 

On the website: 

 

Dashboard → Click on the 3 dots beside the goal from which you want to withdraw → Redeem → Select any reason for redeeming → Custom (tab beside Quick Redeem)→ Enter the amount you want to withdraw from any funds → Review and Confirm Redemption.

 

On the app:

 

Dashboard → The goal from which you want to withdraw  → More → Redeem → Select any reason for redeeming → Custom Redeem → Next → Enter the amount you want to withdraw from any funds → Review and Confirm Redemption.