Issue sheet - awkward format

I am trying to create an output similar to this (but there will be more than 2 series):


I thought the best way to do it was to have the values for each drawing and fill in the blanks with null/false outputs.
So for eg. for drawing 3 I’d have P1, null, C1.

I have some code from @Nick_Boyts that gives me true or false outputs.

I used some code from @kennyb6 on a thread about issue sheets but it only works if I flatten my list.

How do I get this to work?

Naively I thought this was going to be a lot easier.