Array in another array

Hello! I'm having troubles using multidimensional arrays in my project. I will be receiving a string via serial communication that is saved to a byte-array buffer. This string of data or rather "byte-array" of data I want to save to another array. So I want an array to contain maybe 50 to 150 of these byte-arrays and they will sometimes be of different length.

Once I have saved them I want to extract them and send them to another serial port. My problem is that I don't know how to calculate the length of the different byte-arrays saved to the "main" array.

#define buffLength  260
#define arrayLength   4

byte buff[buffLength] = {0xAA, 0x40, 0x00, 0x20, 0x22};
byte buff2[buffLength] = {0xAA, 0x43, 0x02, 0x00, 0x42, 0x25, 0x48};
byte arrayOfBuff[arrayLength][buffLength] = {{0},{0}};

byte savedArrays = 2;

byte buffLen = 5;
bool hasPrinted = false;

void setup() {
  Serial.begin(115200);
  while(!Serial){};
  
  Serial.println("Writing buffer to array... ");

  for(int i = 0; i < savedArrays; i++){
      for(int j = 0; j < buffLen; j++){
          arrayOfBuff[0][i] = buff[i];
      }
      buffLen = 7;
  }
  
  Serial.println("done writing.");
  
  
  Serial.print("The saved array is: ");


  for (int i = 0; i < savedArrays; i++){
      for(int j = 0; j < sizeof(arrayOfBuff[i]); j++){
          Serial.print(arrayOfBuff[i][j], HEX);
      }
  }

}

void loop() {}

In my code I am simulating part of my full project code (which I won't post here) so that buff2 is the "buffer" getting the signal the second time after already saving it to the array. I think that I save the buffer correctly to the array but I'm not sure how I can calculate the length of each byte-array in it.

Each row of the 2 dim array must be of the same length.

You could save an end of data marker after the final data byte in each row to indicate the end of valid data and use that later in the program or you could have a separate single dimension array holding the length of data in each row of the main array or put the length in the first byte of data in each row

UKHeliBob:
Each row of the 2 dim array must be of the same length.

You could save an end of data marker after the final data byte in each row to indicate the end of valid data and use that later in the program or you could have a separate single dimension array holding the length of data in each row of the main array or put the length in the first byte of data in each row

Thank you