This is a process that is used a lot in macro photography, as the focal plane tends to be very shallow, both because the lens is very close to the subject, and also to keep exposures manageable.
The way it works is by taking several photos, with the focus set to a different point on the subject for each one.
Affinity Photo automates the process almost entirely. It's not exactly idiot-proof, but it's pretty easy. And it also provides tools for fixing errors that may arise due to subject movement or what-not.
This is a plastic Reaper Remorrhaz, photographed with a Canon EOS 50D and 28-135mm macro lens.
Below are the three source images I used, focused on the front, middle and back of the model. To the right is the image combined in Affinity Photo.
In retrospect, this was not the ideal model to try this out on. The metallic finish makes finding crisp focus more difficult than it might otherwise be, and my eyes are not as precise these days as they... well, they never really were.
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