To remove an item: Android users: Swipe left, IOS users: Swipe right, tap on remove, you will be prompted to confirm your request, this will remove it from your quote.
To duplicate an item: Android users: Swipe left, IOS users: Swipe right, tap on duplicate, this will then open up into a screen with a copy of your item, here you can edit the details and save. This will add the new item to your quote.
Duplicate an existing item: Click on the 3 green horizontal dots in the item row and select duplicate, a duplicate item will then appear.
Remove an existing item from your quote: If you change your mind and no longer require a particular line item in your quote, click on the cross in the item row, this will remove it from your quote.