Mental notes are a pretty commonly known concept; not that I'm claiming everyone can make them easily, or at all, but they don't typically require focused studying. I'd consider them an example of committing something to memory intentionally. Sure, studying is another way of committing things to memory. You can read something repeatedly and completely ignore it just as much as you can read something repeatedly with the intention of remembering it. You can also make mental remarks without them becoming mental notes. But it is certainly possible to create a memory on purpose. It's just that studying an entire subject requires you to train your understanding quite a bit in order to build a good memory of it, as opposed to memorizing a single simple idea or lesson that you already intuitively understand.
There is no action of "commiting to memory". It's not an action we do, it's a process that results in that.
The actual action we do (when we consciously try to remember something) is e.g. to study (read, repeat, and so on).