How to subplot many figures in one large figure.?

Hi,Dear all!

I have a extended question regarding a plot. I'd like to merge many figs into one plot. Subplot doesnot meet my requirement. Here is a schematic diagram of my purpose.There are six subplots. Each subplot is divided into three parrts. 1,2,3....18 are datas imported from an excel file. Last time, I post a question about plotting a single subplot. Here is the link: https://www.mathworks.com/matlabcentral/answers/454320-how-to-plot-four-subfigures-in-one-figure-rather-than-subplot

Building upon the last answer, I thought to use subplot fuction to get my figure. But it doesn't work at all. Could anybody give me any hints? Thanks.

[KSSV]

Won't this suffice?

for i = 1:18
    subplot(3,6,i) 
end

[Yuchi Kang]

Sorry. It doesn't meet my requirement. Please see the link in my question.