This module adds this funtionality:
Module can be used from two new profiles in the "System -> Import/Export -> Advanced Profiles".
To export rules - start the profile "Export Shopping Cart Rules". File will be saved to the /var/export/ directory.
To import new rules - place file in the /var/import directory and set filename in the profile "Import Shopping Cart Rules" as described on the screenshot:
And then run profile.
Link: Demo page
MD Mark Davies
It got the job done and it saved my hours of work. Once I understood the configuration it is now easy to import more rules very quickly into the system.