Hi
My knowledge of using Excel with MFP is very limited.
The S[column]:[row] syntax is for applying the same formula to each selection, because the [row] is limited 1 to 3.
To access it you need to convert it back to the column name.
From the manual:
to get the custom cell addressed as S14:3 write:
cell_querymarket_id_N(sel_index*3+1)
Having now read this, I don't think this will do what you want. Sorry I could not help, but maybe an email to support?