When you clone a form, you copy everything about the form except the name and slug. All bridge connections, fields, attributes, etc are retained.
There are two ways to clone a form. The first is using the drop down for the form within the form listing.
And the second is from within the form settings.
Either option will present you with the clone form prompt, where you fill in the new name of the form. The slug will auto-fill as you type the name, though you can modify it if desired.
Once you fill that in and click Clone, the system will create the clone with the new name and slug and take you to it.