Whatever works for you is fine. What I would usually do is put the number that I actually shot on in the PMPS box, and then the earlier numbers in a note - click on the PMPS square, then right click and scroll down to "insert note" then you can type the earlier numbers (and if you want, an explanation to help you remember what happened) in the box that pops up.
I've also seen people put the number they shot on in the PMPS, and any earlier numbers in the +11 square.
Or some people put them all in the PMPS square and then just manually set the color for the square to whatever it should be.
So again, whatever works best for you is fine.

There is a lot of variety around here for those things.