I understand what you are saying I think.
If it's under the A category, that means it can be fed every day even though it says almost daily.
If it's under the B category, it can be fed 2-4 times per week. Not everything in this B list should be fed 4 times per week. It it's really high in some things like calcium, vitamin A or oxalic acid, it's best limited to twice per week. An example is Parsley. High in oxalic acid and Vitamin A. Better to give only twice per week. On the other hand, cucumber could be fed every 2-3 days because it's low in oxalic acid and A but one of the reasons it's limited and isn't good for daily use is because of the high water content. I'd also completely avoid spinach as it's through the roof in oxalic acid and has a very high A content. Also very high in calcium. I do not feed spinach to any of my animals. If you want to feed it, then do so in very tiny portions. A couple baby leaves would do it.
If it's under the C category, it can be fed occasionally or 1-2 times per week.
If it's under the D category, it can be fed 1-2 times per month.
Now what you are asking (I think) is if you can feed several things from the C category during the week. Yes, but you need to rotate the veggies around and not feed them all on the same day. So if your pigs love Kale, they can have it 2 times per week. Say Monday and Thursday. Then on Tuesday and Friday, you could give kiwi one day and apple the other day for variety. Then on Wednesday and Saturday you could give mustard greens one of the days and a small broccoli floret the other day.
This way they aren't getting overinundated with too much calcium, oxalic acid, vitamin A, etc., but they are getting a good amount of C.