I have project library in jace using $2$d array

I have bill class before but i want to manage it by this thing in another class or the main class

Iwant to make bill $2$d array that include name costumer

Phone

Book info

And total price

And then display the bill

I already have array for books that have books info

And i want costumer to inter the library by name and phone then i will display the book in library and let him choose the book he want by the id

If he enter the id then that book info will display and the show the bill price

$($add choice to buy more than one book $)$

Pleaseeeee in need it today tommorow my presentation