Merge saved figures into one figure in the same plot

I found this relevant question in this link: https://www.mathworks.com/matlabcentral/answers/478355-combine-three-or-more-matlab-figures

I was unable to replicate the code from user "meghannmarie" in the forum and my figures would not merge. It would produce a blank plot. I am new to this technique of combining figures on Matlab (I'm generally used to merging figures using "hold on" and then "plot," but I am unable to use this for my code) and any advice or additional information is much appreciated. I think the issue could be due to the axes being different, but I am not too sure because I am trying to understand what "children" and "parent" are. Thank you for your time.

fig = figure();
ax = axes(fig);
hold on
h1 = openfig('T_900K.fig','reuse');
h2 = openfig('T_1000K.fig','reuse');
h3 = openfig('T_1100K.fig','reuse');
h4 = openfig('T_1200K.fig','reuse');
h5 = openfig('T_1300K.fig','reuse');
h6 = openfig('T_1400K.fig','reuse');
copyobj(h1.Children.Children,ax);
copyobj(h2.Children.Children,ax);
copyobj(h3.Children.Children,ax);
copyobj(h4.Children.Children,ax);
copyobj(h5.Children.Children,ax);
copyobj(h6.Children.Children,ax);
close(h1);
close(h2);
close(h3);
close(h4);
close(h5);
close(h6);

Answer 1

[masterm667]

I managed to find the answer to my own question. If anyone was curious, the following video was very helpful: https://www.youtube.com/watch?v=x4TXEaAYfMw

My code is as follows:

h1=hgload('T_900K.fig');
h2=hgload('T_1000K.fig');
h3=hgload('T_1100K.fig');
h4=hgload('T_1200K.fig');
h5=hgload('T_1300K.fig');
h6=hgload('T_1400K.fig');

figure
h(1)=subplot(1,1,1);

copyobj(allchild(get(h1,'CurrentAxes')),h(1));
copyobj(allchild(get(h2,'CurrentAxes')),h(1));
copyobj(allchild(get(h3,'CurrentAxes')),h(1));
copyobj(allchild(get(h4,'CurrentAxes')),h(1));
copyobj(allchild(get(h5,'CurrentAxes')),h(1));
copyobj(allchild(get(h6,'CurrentAxes')),h(1));