Upload data to updated current directory

I have the following current directory to save my project data:

% Project path, data parent settings:

cd 'C:\Users\Alex\Documents\MATLAB\Projects'

A = ‘Project name’

B=’Site name’

C=’Data’

mkdir( fullfile(A,B,C))

% I need to upload a data file to ‘C’ the from one file from PC.

[file,path] = uigetfile('*.xlsx');

if isequal(file,0)

disp('User selected Cancel');

else

disp(['User selected ', fullfile(path,file)]);

end

Q: How can I upload these data in ‘C’ file?? Under the following cd:

cd 'C:\Users\Alex\Documents\MATLAB\Projects\Project name\ Site name\Data'

[Bob Thompson]

What do you mean by 'upload?' Do you want to save a file, or are you trying to load some data? If you are trying to save something, do you want to save the variables directly, or the data contained within the variables?

[Ethar Alkamil]

I need to save excel file to the new created file using "mkdir", and my problem is how to update the current directory by adding the new created folder name to it to save the data, I hope is it clear now