Filtering using FFT for audio signal

This code i have written for low pass filters but my main objective is to filter out multiple frequency. Please help me/ guide me to modify this further to achieve that.

Fs= 8000 ;

 %sampling freq 
T=1/Fs;%sampling period
nBits = 16 ; %number of bits per sample
nChannels = 1 ; %number of channel 
ID = -1; % default audio input device 
recObj = audiorecorder(Fs,nBits,nChannels,ID);



% recObj = audiorecorder;
disp('Start speaking.')
recordblocking(recObj, recordingtime);

disp('End of Recording.')
% play(recObj)


data = getaudiodata(recObj);
filename = 'Sample.wav';
audiowrite(filename,data,Fs)
y= audioread('Sample.wav');
sound(data,Fs);
pause(recordingtime+1)

%using fft to observe the signal
NFFT = length(y); %length of signal


Y = fft(y); %N point DFT
F = ((0:1/NFFT:1-1/NFFT)*Fs).';



%respponse 
magnitudeY = abs(Y);        % Magnitude of the FFT
phaseY = unwrap(angle(Y));  % Phase of the FFT
figure;
subplot(3,1,1)
plot(F,magnitudeY)
title('Orignal signal')
xlabel('frequency')
ylabel('Amplitude response')

% To see the effects of changing the magnitude response of the signal,

Ylp = Y;
 Fn = Fs/2;                                                  % Nyquist Frequency
 fc = 1500;                                                  % Cutoff Frequency (Hz)
 fcnm = fc/Fn;   %normalized
n1=1:round(fc/Fs*NFFT); %low frequency band
n2=(1+NFFT)-round(fc/Fs*NFFT):NFFT; %mirror low frequency band 


%lowpass filter 
Ylp(length(n1)+1:n2(1)+1)=0;

figure;
plot(F,abs(Ylp))
title('LPF')
xlabel('frequency')
ylabel('Amplitude response')

Answer 1

[Chaitanya Mallela]

Refer the link

https://www.mathworks.com/matlabcentral/answers/503999-filtering-for-multiple-band-of-frequncies

which describes the filter design allowing specific frequency components and filters out unwanted frequencies.