Cycle through expressions on multiple charts with one input variable

[#1]

I have a screen where there are 10 different charts that all measure sales over time. (Each chart has different set analysis to make a different view.) I would like to be able to substitute the sales in my expression, =sum(  "set analysis"  sales) that is in each of the 10 charts with transactions, =sum( "set analysis" transactions).

Is there a way to set up an input box that would make this more dynamic? I do not want to have to use a group-by expression for each chart and then cycle through the expressions that way.

Thanks in advance for any help.

[#2 · Accepted solution]

http://community.qlik.com/message/78534#78534

Found the answer for this. Use $(vVariable) in place of sales and then set up an input box, where you can type sales or transaction.