When you need to create forms that are similar to a form you have already created, copying the existing form is about as easy as it gets.
You can copy a form by pressing the Copy Icon of the form you want to copy on the Forms page or the Quick Access section of the dashboard. Alternatively you can open the Form Detail page and press the Copy button there.
After you’ve pressed Copy a dialogue will appear which will ask you how to name the copied form. When you confirm this Save Copy As action your new form will open in the form designer.