How do I manually add existing provisioning profiles and certificates to fastlane match?

I have a large number of existing apps in product and I would like to use the existing profiles and certificates in fastlane match.

I understand that fastlane match can only work with the profiles and certificates it has created in the first place, but I am reluctant to "nuke" as suggested.

Is this possible?

I wonder if I manually add to the Git repo in the form that match expects whether that will be enough.

Solution

There is a manual that explains how to manually add profiles and certificates at http://macoscope.com/blog/simplify-your-life-with-fastlane-match/#migration

Edit: Wayback Machine link since the above isn't loading anymore: https://web.archive.org/web/20161124141102/http://macoscope.com/blog/simplify-your-life-with-fastlane-match/