It is a bit annoying that you can't enter the recipes automatically, but you can either enter each ingredient from the list individually, or you can enter your own Syns. Just enter the title of the recipe, and then you can put in the amount of syns.
The point of the planner is so that you an see how many portions of free food you've had, and when you look at the overview you'd also be able to see how many portions of S and P foods you've had.
As for entering individual amount of something, I assume you are looking under the 'healthy extra' section when you mentioned it above? For your healthy extras, you are meant to eat those portions, or you aren't gettinn enough calcium/fibre (depending of if its a or b) in your diet. They recommend those portions to give you enough each day. You will be able to put in that you've had a single babybel, but you'll have to use the Syns section and use your Syns for it. Same with the milk as far as I'm aware.
I use the online planner, so let me know if you get stuck