Hi
Remark: When you post about a chart it's important to say what is the chart type
This solution will work for some chart types.
You have to make your own X-axis.
Steps:
1 - Set the minimum value for the default X-axis to 100 and hide it. To hide the axis, in the Format Axis set "Major tick mark type", "Minor tick mark type" and "Axis labels" all to "None"
2 - Add the line that will be your axis: Add a scatter series with points where you want the labels. All with Y=0. In your case the points (100,0), (500,0), (1000,0)
3 - Add labels to the points