Hi guys, i new your help on my system which im stuck on how to remove a line of data in the text.file & how to search the data based on the "Item_code" only

Code:
#include <stdio.h>
#include <math.h>


int Choice,Item_Code,Item_Qty,year,Halogen,i;
float Item_Price;
char Item_name [21],Item_date [21],Item_Value [10], choose;


int main ()
{


printf("\n*********************************************************");
printf("\n**********Electronic Component Inventory System**********");
printf("\n*********************************************************\n");


printf("\nMain Menu");
printf("\n---------");
printf("\n1.Show All Component List");
printf("\n2.Add Component");
printf("\n3.Remove Component");
printf("\n4.Search Item Inventory slot");
printf("\n5.Exit");


printf("\n\nPlease Choose your option:");
scanf("%d",&Choice);


switch (Choice)
{
case 1:
    printf("You have selected Show All Component List\n");
    FILE *f;
       f = fopen("test.txt","r");


       printf("\Code\tName\t\tValue\tPrice\tQty\tDate");


       while (fscanf (f," %d",&Item_Code) !=EOF){
    fscanf(f," %s", &Item_name);
    fscanf(f," %s", &Item_Value);
    fscanf(f," %f", &Item_Price);
    fscanf(f," %d", &Item_Qty);
    fscanf(f," %s", &Item_date);
    printf("\n%d\t%s\t%s\t%.2f\t%d\t%s",Item_Code,Item_name,Item_Value,Item_Price,Item_Qty,Item_date);}
    //{
    //printf("%d",Item_Code);
    //}
    fclose(f);
    break;
case 2:
    print_item();
    for(i=0;i<5;i++){
    printf("\nDo you want to continue?Y/N = ");
    scanf(" %c", &choose);
    if(choose=='Y')
    print_item();
    else if(choose=='N')
    break;}
case 3:
    printf("You have selected Remove Component\n");
void search()
{
  int sh;
      design();
      gotoxy(17,6);
      printf("\xDB\xDB\xB2  Two options available to search \xB2\xDB\xDB");
      gotoxy(15,9);
      printf("[ 1 ]  -  Search by ID number   .");
      gotoxy(15,11);
      printf("[ 2 ]  -  Search by Description .");
      gotoxy(17,15);
      printf("Enter your choice:: ");
      sh=toupper(getch());


  switch(sh)
  {
    case '1':
    search_id();
    break;


    case '2':
    search_name();
    break;


    default:
    gotoxy(18,18);
    printf("\a\xDB\xDB wrong entry try again");
    getch();
   }
  getche();


}


    break;
case 4:
    printf("You have selected Search Item Inventory Slot\n");
    break;
case 5:
    printf("You have selected Exit\n");
    break;
default:
    printf("Invalid option selected\n");
}
return 0;
}


void print_item()
{
    FILE *f;
    printf("You have selected Add Component\n");
    f = fopen("test.txt","a");


    printf("Enter your Item Code :");
    scanf ("\n %d",&Item_Code);
     printf("Item Code = %d Recorded\n",Item_Code);


     printf("Enter your Item Name :");
     scanf ("\n %s",&Item_name);
     printf("Item Name = %s Recorded\n",Item_name);


    printf("Enter your Item Value :");
     scanf ("\n %s",&Item_Value);
     printf("Item Value = %s Recorded\n",Item_Value);


printf("Enter your Item Price :");
     scanf ("\n %f",&Item_Price);
     printf("Item Name = RM %.2f Recorded\n",Item_Price);


    printf("Enter your Item Qty :");
    scanf ("\n %d",&Item_Qty);
     printf("Item Qty = %d Recorded\n",Item_Qty);


    printf("Enter your Item Date :");
    scanf ("\n %s",&Item_date);
     printf("Item Date = %s Recorded\n",Item_date);


    fprintf(f,"\n%d\t%s\t%s\t%.2f\t%d\t%s",Item_Code,Item_name,Item_Value,Item_Price,Item_Qty,Item_date);
    //fprintf(f,"\n%d %s %s %.2f %d %s",Item_Code,Item_name,Item_Value,Item_Price,Item_Qty,Item_date);
    fclose(f);


    f = fopen("test.txt","r");
    printf("\nItem Code Item Name Item Code Item Date");


       while (fscanf (f," %d",&Item_Code) !=EOF){
    fscanf(f," %s", &Item_name);
    fscanf(f," %s", &Item_Value);
    fscanf(f," %f", &Item_Price);
    fscanf(f," %d", &Item_Qty);
    fscanf(f," %s", &Item_date);


    printf("\n%d\t%s\t%s\t%.2f\t%d\t%s",Item_Code,Item_name,Item_Value,Item_Price,Item_Qty,Item_date);}
    //printf("\n%d %s %s %.2f %d %s",Item_Code,Item_name,Item_Value,Item_Price,Item_Qty,Item_date);}
    fclose(f);
    return 0;


}