You can easily expand your wall sticker planning board with an extra column. The column has eight rows and perfectly matches the dimensions of the "wall sticker planning board, week (27x63 cm)". If you have space on the wall/door/cabinet, there's no limit to how many you can plan for!
The fields you write on are 7.5 x 7.5 cm.
You can, of course, use this wall sticker separately if you only want one or a couple of nice squares to decorate with and write notes on. Write notes using chalk or, for best results, a chalk pen/chalk marker.