Use structures in a parfor loop

Hello everyone.

I have a problem using structures in a parfor loop. I would like to save my output of the parfor loop in a structure called "Output".

if strcmpi(String.Frequency_Filter,'Yes')
    WaitMessage = parfor_wait(NN,'Waitbar',true);
    if strcmpi(String.Output_type, 'displacement') || strcmpi(String.Differentiation_Variable, 'Frequency')
        parfor ii=1:NN
            if strcmpi(String.DOF,'X')
                Output.u_G_Interp(ii,:)=bandpass(Output.u_G_Interp(ii,:),B,fs);
            elseif strcmpi(String.DOF,'Y')
                Output.v_G_Interp(ii,:)=bandpass(Output.v_G_Interp(ii,:),B,fs);
            elseif strcmpi(String.DOF,'Z')
                Output.w_G_Interp(ii,:)=bandpass(Output.w_G_Interp(ii,:),B,fs);
            elseif strcmpi(String.DOF,'XYZ')
                Output.u_G_Interp(ii,:)=bandpass(Output.u_G_Interp(ii,:),B,fs); Output.v_G_Interp(ii,:)=bandpass(Output.v_G_Interp(ii,:),B,fs); w_G_Interp(ii,:)=bandpass(Output.w_G_Interp(ii,:),B,fs);
            end
            WaitMessage.Send;
        end
    end
end

Unfortunately (like in the figure below) it is not possible to use directly structures in a parfor loop and I cannot use a temporary variable inside the parfor loop and after writing it inside my structure because the if that i will use in the parfor loop depends on a defind String in the main of my code and not all the variables exists. For example if i have String.DOF='Z' just the w_G_Interp variable exists and I get an error in writing the u_G_Interp variable beacause it doesn't exist.

if strcmpi(String.Frequency_Filter,'Yes')
    WaitMessage = parfor_wait(NN,'Waitbar',true);
    if strcmpi(String.Output_type, 'displacement') || strcmpi(String.Differentiation_Variable, 'Frequency')
        parfor ii=1:NN
            if strcmpi(String.DOF,'X')
                u_G_Interp(ii,:)=bandpass(Output.u_G_Interp(ii,:),B,fs);
            elseif strcmpi(String.DOF,'Y')
                v_G_Interp(ii,:)=bandpass(Output.v_G_Interp(ii,:),B,fs);
            elseif strcmpi(String.DOF,'Z')
                w_G_Interp(ii,:)=bandpass(Output.w_G_Interp(ii,:),B,fs);
            elseif strcmpi(String.DOF,'XYZ')
                u_G_Interp(ii,:)=bandpass(u_G_Interp(ii,:),B,fs); v_G_Interp(ii,:)=bandpass(Output.v_G_Interp(ii,:),B,fs); w_G_Interp(ii,:)=bandpass(Output.w_G_Interp(ii,:),B,fs);
            end
            WaitMessage.Send;
        end
    end
end
Output.u_G_Interp=u_G_Interp;
Output.v_G_Interp=v_G_Interp;
Output.w_G_Interp=w_G_Interp;

I hope the question is clear and thank you in advance for the reply.