How to create a data structure

Hallo Everyone, I needed a help in creating a data structure. I am new to this platform. it would be helpful if someones guides me through giving information or an example. I have a set of data's in an excel sheet. I need to create a data structure of it. I have set of turbines(1-5) each are having its own respective towers(1-10) having some field names. If i need to add a field name in any of my tower it should update the turbine too. How can i create a data structure for it. Thank you. Its in the form of tree.

[KSSV]

Show us an example......this information is vague....

[anush]

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/matlabcentral/answers/uploaded_files/86535/turbinr.PNG>>

i tried

function [ struct_data ] = Initialize_Data_Structure( no_turbines, no_towers ) % Initialize_Data_Structure initialises the data structure and fills with dummy data

struct_data.Diagram.Frequency_Linits=[0,1]; struct_data.Diagram.Windspeed_Linits=[0,1]; struct_data.Diagram.Rotor_Speed_Linits=[0,1]; struct_data.Diagram.Gen_Speed_Linits=[0,1];

for ii=1:no_turbines struct_data.Turbine(ii,1).Name=''; struct_data.Turbine(ii,1).Gear_Ratio=0; struct_data.Turbine(ii,1).Rotor.Speed=zeros(2,1); struct_data.Turbine(ii,1).Rotor.Mode_Names=cell(2,1)'; struct_data.Turbine(ii,1).EF_Names={'EF1','EF2'}; struct_data.Turbine(ii,1).EF_Wind_Speed=zeros(2,1); struct_data.Turbine(ii,1).EF_Rotor_Speed=zeros(2,1);

    for jj=1:no_towers
        struct_data.Turbine(ii,1).Tower(jj,1).Name= num2str(jj,'Tower %d');
        struct_data.Turbine(ii,1).Tower(jj,1).EF_Data= zeros(2,2);  
          % first dimension Names, second dimension operating points (wind, speed)
    end
end

end

Each turbine has respective all towers.