[~, ~, D] = xlsread('Multilevel_sorting.xlsx');
A = D(3:end,1:2); % your data in table 1
G = {'Group1','Group2','Group3','Group4','Group5'};
for k = 1:numel(G)
B{k} = A(strcmp(A(:,2),G(k)));
B{k} = [G(k); unique(B{k})]; % remove G(k) if you don't need the Group headers
end
B is your table 2. To see the elements in B, just type B{1} for Group1, B{2} for Group2 and so on.
