Is your prices measure field coming from data source?
Do you want the user to enter the value so the Prices value will change accordingly like:
Prices *parameter value is that what you are looking for?
If that is the requirement then follow below steps:
1. Create parameter with data type as integer and keep it as All.
2. Create calculated field and in that add Prices * Parameter
3. Drag this calculated field on to the row shelf or column shelf and right click on the parameter and show parameter control.
So based on the user input the chart will change accordingly.
I hope it is what you are looking for.
What you are describing is not quite what I need. I have a table as per below and I need to able for the price to be user updateable. The other fields are fixed and the calculated field = ([Price]-[Cost])*[Yield]. I don't want to have to create an individual calculated field per product / parameter. Is there a way to update the price for A to E?
Product Price Cost Yield Calc A 100 10 0.05 4.5 B 300 250 1.5 75 C 200 50 0.45 67.5 D 200 100 0.75 75 E 100 25 0.25 18.75