#include <iostream>
#include <string>
#include <vector>
#include <utility>
// !! You had no use for iomanip

using namespace std;

struct ITM_TYPE
{
    std::vector< std::pair< std::string, float > > items;
    int seatN;
};

// !! You had an unused function here

int main()
{
    // !! These had no business being global variables
    int N_ITEMS;
    int N_SEATS;
    int seat;
    int tItems = 0;

    cout << "Enter the number of seats: ";
    cin >> N_SEATS; //retrive number of seats

    // !! This is not needed if you iterate starting at 0
    N_SEATS += 1;

    // !! You can not dynamically create arrays like you did. Do it like below
    // !! Also you used N_ITEMS incorrectly as opposed to N_SEATS
    // !! This was also out of scope inside the for (the second for did not know it existed)
    // !! Plus it was being re-created on every iteration
    std::vector< ITM_TYPE > items;

    for( seat = 1; seat < N_SEATS; seat++ ) // loop for each seat
    {
        cout << "Enter number of items for seat" << seat <<": ";
        cin >> N_ITEMS; //get number of items for seat
        tItems += N_ITEMS;

        string name;
        float price;

        ITM_TYPE nItem;
        nItem.seatN = seat;

        // !! If you are initializing an iterator variable, then incrementing on each
        // !! loop, then just use a for instead of a while. Thats why it exists
        for( int i = 0; i < N_ITEMS; i++ )
        {
            cout << "Input item name: ";
            cin >> name;

            cout << "item[" << i << "].name SET" << endl;
            cout << "Input item price: ";
            cin >> price;

            cout << "item[" << i << "].price SET" << endl;

            nItem.items.push_back( std::pair< std::string, float >( name, price ) );
        }

        items.push_back( nItem );
    }

    for( int i = 0; i < items.size( ); i++ )
    {
        std::cout << "Seat #" << i + 1 << std::endl;

        for( int j = 0; j < items[ i ].items.size( ); j++ )
            std::cout << "Name: " << items[ i ].items[ j ].first << "\nPrice: " << items[ i ].items[ j ].second << std::endl;
    }

    system( "pause" );

    // !! You did not indicate a successful end of program
    return 0;
}