Please attach as twbx-file and I will atempt to assist.
If you are wanting to have two variables in your view at the same time where one shows the total quantity and the other shows the quantity based on your parameter selection, here is how you can make that work.
Let's say I make a parameter called "Category Selection". This parameter holds values that exactly match my category list.
I could now make a calculated field called "Filtered Quantity". Inside this calculated field I would write:
IF [Category] = [Category Selection] THEN [Quantity] END
This variable will only store values for the category I have selected in the parameter list. Also, I am only filtering this particular variable while NOT filtering my overall quantity from my original "Quantity" variable.
You can now create a combo/dual axis view where both your "Quantity" and "Filtered Quantity" variables are represented on your axis. When you select values from your parameter list, the "Filtered Quantity" value will reflect that particular selection and your "Quantity" value will remain untouched.
Best of luck!
Thanks for the help -- it worked perfectly
I'll post the twbx next time -- thanks!