using the mysql example ajax grid here [url removed, login to view]
place multiple mysql-linked grids on a single page
attach them to a html table column structure
add a html text form input field that returns matching mysql rows to all grids simultaneously (default position is no grid rows show)
add an "add row" button that inserts new row into grid and mysql
change the number formatting: 1000's separator from dot to comma, and decimal place from comma to dot
and explain to me how you did it
simple... no styling, no fancy design, no bells and whistles.