how to overwrite the structure reading data from xls file

Hallo everyone, how can i overwrite my structure data after reading the data from an xls file.. I need to store the particular cell value to my structure

function [my_struct] = read_Data(FileName,SheetName)

[~,~,raw]=xlsread('xyz','Data');
% Data(cellfun(@(x) ~isempty(x) && isnumeric(x) && isnan(x),data)) = {''};
%%Allocate imported array to column variable names

mystruct = cellVectors(:,1);
mystruct.device(ii,1).Name = data(:,1);
mystruct.device(ii,1).value = data(:,2);

my_struct=raw;
end