Updating a chart dynamically in Numbers
To save on the cramming part of the Chart you could try using an interactive Chart with a scroll bar.

1, Start a new sheet and fill it with your data:





2, Go to the Chart menu and select Interactive Chart &amp; the style you want. 



I have chosen the simplest. Others you may have to play more with.





3, Click the Chart and then it's  Add Chart Data button.

 



4, select either rows by clicking on each day of week row.







4.1 Or Columns by clicking on the WEEK columns







5, Click the DONE button at the bottom of the page when you have completed your selection.

If you need to remove/add a column or row from the Chart data. Then Click the Chart. And then the Edit Chart Data button.

Adding is the same as you did before.

Removing is clicking on the row or column and hitting the delete/backspace key.
this does not remove the eta from the sheet only from the chart.



The chart I chose has a scroll bar which you can scroll through.







You can change the text size by using the format palettes.

And you can add labels to the Chart columns 



by using



If I figure how to make it pick up the sheet info by it's self I will update.