How do I add and delete folders in the Cost Estimator app? Adding folders helps keeps projects organized and is completed customizable! To get started, tap the pencil icon to enter edit mode and then tap Add Folder to get started.Be sure to tap the X on the upper right corner when completed to exit edit mode.Also, please note you’ll need to have at least one folder ready before you create an estimate or you won’t be able to save it! See the tutorial below and follow along to quickly create your custom folders.