How do I update the chart axis values??

I created a Gantt (bar chart) chart in Numbers for a project at work showing schedules. It looked fine, and everything worked great. I want to use that same chart, but I want to just update the data in it. I can get the bars to change, but the Y axis data (not the numbered values in the chart, but rather the the actual names out to the side of the chart) will not change. For instance....
Name
Start Date
Finish
Task 1
January 1, 2013
January 15, 2013
Task 2
February 1, 2013
February 15, 2013
The Tasks on the left will be the Y axis fields in a bar chart....and the dates will populate the graph. I've created my graph from this data and got it like I want it. Now let's say I want to simply change some things in the Name column:
Name
Start Date
Finish
New Task
January 1, 2013
January 15, 2013
Task 4
February 1, 2013
February 15, 2013
So without creating a new chart or anything, I just want to reflect the new names in my existing chart. In Excel, when you change the value data, it updates the chart and "it just works" . I'm wanting to use Numbers for this, and I feel like this is a simple thing that I'm just missing. Help!

Jerrold....thanks for the reply. While you didn't answer my question exactly (I know I was a bit vague), you did put me on the right path. I was trying to get the Category Axis values to change on the chart whenever I updated them in the table itself. I couldn't figure out why they weren't but I think I have now.
I noticed that in the Category Axis field (Inspector) it had the actual typed names of my tasks from the table instead of the cell locations. So...."Task 1" instead of "Table 1: C7". I cleared out all of the text in the Category Axis field, which removed it from the chart. then I just clicked on the fields in the table and it populated the Category Axis blank with the table/cell info instead of the text. So now when I update one of the fields, it updates the chart because it's pulling from the cell data every time.
I'm not really sure why Number, by default, enters the text into the Category Axis when making a chart instead of putting in the corresponding cell locations, but whatever. I got it working now and should be good to go going forward, thanks for your help.

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How do I update the chart axis values??

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