You can clone the existing form in two ways
Clone from List View
Clone from Config View
Clone form List View
Click “Forms”
Click the “+” icon of the form which you want to clone
Click “Clone” icon
Do the necessary changes & Click “Save and Exit”
Clone from Config View
Click “Forms”
Click the form which you want to clone
Click the down arrow which is near to Close
Choose “Clone”
Do the necessary changes & Click “Save and Exit”